Malicious PDF — malware analysis report

Static analysis result for SHA-256 add4ad1210ba08c5…

MALICIOUS

PDF

251.8 KB Created: 2021-07-03 17:59:07 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 23b7d14056029add51ee167eef5b5a7b SHA-1: 391d1b907224c925b34bccfe889c2e9a100ec3f1 SHA-256: add4ad1210ba08c528145b957772a7924a61a5bbebaab1225ca133495c8be4f1
258 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1041 Exfiltration Over C2 Channel

This PDF document employs a game hack lure to trick users into visiting a malicious URL, identified as http://netcdn.tw/app/1330123889/pubg-uc-100-game-hack. The document also presents a fake CAPTCHA and an MFA harvesting lure, suggesting an attempt to steal credentials or session tokens. The presence of multiple redirector links and brand impersonation further supports a phishing attack.

Machine Learning

  • Nyx PDF Classifier clean score 0.0098

Heuristics 8

  • PDF links to a 'free generator / game hack' redirector critical PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: http://netcdn.tw/app/1330123889/pubg-uc-100-game-hack.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://netcdn.tw/app/1330123889/pubg-uc-100-game-hack In PDF document text
    • https://elearning.mtsn2magetan.sch.id/__statics/gudangsoal/files/coin-master-free-spin-today-2021_GM406889139.pdfIn PDF document text
    • http://elearning.mtsn2magetan.sch.id/__statics/gudangsoal/files/how-to-hack-roblox-with-dll-injector_GM431946152.pdfIn PDF document text
    • http://elearning.mtsn2magetan.sch.id/__statics/gudangsoal/files/minecraft-free-education_GM479516143.pdfIn PDF document text
    • http://elearning.mtsn2magetan.sch.id/__statics/gudangsoal/files/reddit-robux-hack_GM431946152.pdfIn PDF document text
    • http://elearning.mtsn2magetan.sch.id/__statics/gudangsoal/files/free-robux-codes-w018_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn2magetan.sch.id/__statics/gudangsoal/files/coin-master-online-hack-link_GM406889139.pdfIn PDF document text
    • http://elearning.mtsn2magetan.sch.id/__statics/gudangsoal/files/free-links-for-free-coins-and-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://elearning.mtsn2magetan.sch.id/__statics/gudangsoal/files/coin-master-free-foxy-food_GM406889139.pdfIn PDF document text
    • https://elearning.mtsn2magetan.sch.id/__statics/gudangsoal/files/free-robux-generator-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://elearning.mtsn2magetan.sch.id/__statics/gudangsoal/files/free-spin-link-in-coin-master_GM406889139.pdfIn PDF document text
    • https://elearning.mtsn2magetan.sch.id/__statics/gudangsoal/files/coin-master-hack-ios-jailbreak_GM406889139.pdfIn PDF document text
    • http://elearning.mtsn2magetan.sch.id/__statics/gudangsoal/files/get-free-tiktok-followers_GM835599320.pdfIn PDF document text
    • https://elearning.mtsn2magetan.sch.id/__statics/gudangsoal/files/haktuts-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://elearning.mtsn2magetan.sch.id/__statics/gudangsoal/files/coin-master-free-spins-and-coins-today-gift-reward_GM406889139.pdfIn PDF document text
    • https://elearning.mtsn2magetan.sch.id/__statics/gudangsoal/files/is-there-anyway-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://elearning.mtsn2magetan.sch.id/__statics/gudangsoal/files/coin-master-hack-without-human-verification-india_GM406889139.pdfIn PDF document text
    • http://elearning.mtsn2magetan.sch.id/__statics/gudangsoal/files/roblox-simulator-hack_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn2magetan.sch.id/__statics/gudangsoal/files/free-robux-with-no-verification-2021_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn2magetan.sch.id/__statics/gudangsoal/files/how-to-get-free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://elearning.mtsn2magetan.sch.id/__statics/gudangsoal/files/free-mguis-roblox-advanced_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_024_off0003823c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3823C 26180 bytes
SHA-256: 030ee32eb8a9090e78a631666078ca12dced026261cb81e36bc8e24fcdfae2e2
font_01_sfnt_off0003bfab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3BFAB 18404 bytes
SHA-256: 6694d3952cf45525c01fa1d274a2019460829626fd655f89a4fc907f73693da1

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