Malicious PDF — malware analysis report

Static analysis result for SHA-256 8841d40b9f5f9de0…

MALICIOUS

PDF

251.3 KB Created: 2021-07-04 10:19:51 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 86d8648c53fdfd899c048746edbc78c1 SHA-1: 6a7874566093deac4787e88f7638446add497427 SHA-256: 8841d40b9f5f9de085e0e7522419467154216d5490aa50295abebfe6d764b5ec
258 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1555.003 Credentials from Password Stores T1041 Exfiltration Over C2 Channel

This PDF document employs multiple lures, including a fake CAPTCHA, urgency prompts, and brand impersonation (Apple), to trick users into clicking a malicious link. The primary link, http://netcdn.tw/app/1330123889/pubg-uc-shopee-game-hack, is identified as a known malicious redirector and is associated with game hack and free generator lures. The document's structure and embedded links suggest an attempt to phish for credentials or MFA codes, aligning with common phishing tactics.

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-shopee-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-shopee-game-hack In PDF document text
    • https://digilib.stieama.ac.id/repository/cringe-trying-to-have-free-robux_GM431946152.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/fb-coin-master_GM406889139.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/where-to-enter-free-robux-codes_GM431946152.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/coin-master-hack-org_GM406889139.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/get-free-builders-club-on-roblox-2021_GM431946152.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/como-hackear-roblox-apk-mediafire-para-ir-mas-rapido_GM431946152.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/free-robux-youtube_GM431946152.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/get-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/cheat-engine-roblox-lumber-tycoon-2-table_GM431946152.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/free-money-limited-tk-roblox_GM431946152.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/free-robux-for-kids_GM431946152.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/game-on-roblox-free-items-on-the-catalog-no-hack_GM431946152.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/can-you-make-free-clothes-on-roblox_GM431946152.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/how-to-get-robux-the-easy-way-by-hacking-2021_GM431946152.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/coin-master-free-spins-link-no-verification-2021_GM406889139.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/how-to-run-cheat-engine-with-roblox_GM431946152.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/roblox-hack-download-2021-android_GM431946152.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/when-you-you-download-roblox-is-it-free_GM431946152.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/minecraft-for-macbook-free_GM479516143.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/builders-club-roblox-free-account_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_024_off00038032.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x38032 25928 bytes
SHA-256: b2087fff0d685c3d84ef863e6a193ea81d109aaae79c5dc51025c0f03ef1c08c
font_01_sfnt_off0003bd38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3BD38 18612 bytes
SHA-256: f16fdd07d3a26b3e9072ec568b4884d00cf33ee514511f617f4351ae4b692c7f

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