Malicious PDF — malware analysis report

Static analysis result for SHA-256 828326e1a89c9fb5…

MALICIOUS

PDF

250.1 KB Created: 2021-07-06 10:32:34 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 402625ba08c2f05135895aaab6c42f16 SHA-1: 099711b8509a2820bda8acfd9c27cd93e17cca70 SHA-256: 828326e1a89c9fb56d9b6305a614396eb72c9e0b23402dcab58f13f98f2bbe11
258 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains multiple heuristics indicating a credential phishing and redirection lure. It impersonates Apple, presents a fake CAPTCHA and MFA prompt, and links to a known malicious redirector. The document body, though heavily obfuscated, contains the primary malicious URL, suggesting an attempt to trick users into clicking it for a fake 'game hack' or discount.

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-on-discount-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-on-discount-game-hack In PDF document text
    • http://pustaka.ust.ac.id/repository/free-assassin-roblox-coins_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/ww-robux-hack-top_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/how-to-get-obc-in-roblox-for-free-2021_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/free-roblox-codes-march-2021_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/roblox-working-strucid-aimbot-hack-2021-agust_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/minecraft-hack-mod_GM479516143.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/boku-no-roblox-legendary-hack_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/speed-city-roblox-hack_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/coin-master-free_GM406889139.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/free-cute-girl-clothes-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/get-robux-today_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/how-to-hack-someones-roblox-account_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/coin-master-hack-apk-latest-version-2021_GM406889139.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/dragon-ball-z-final-stand-free-roblox-hack_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/best-free-roblox-outfits-2021_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/roblox-x-ray-hack-autohotkey_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/roblox-limited-lua-hacks_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/free-red-hair-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/free-completed-shirt-template-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/earn-free-robux-on-roblox_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_off00037ae1.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x37AE1 25928 bytes
SHA-256: 140d9d0daf7039d8fcf07bb35e3265d3e16fc1b979b2175130d298a49fa6f76b
font_01_sfnt_off0003b7fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3B7FC 18660 bytes
SHA-256: 4a0fd46508dc4502bd4e0e7c8af490abde5a5d07a8511b1897802023350c6ea6