Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa9d758fed5a844e…

MALICIOUS

PDF

44.8 KB Created: 2021-06-08 14:38:12 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 61119485c27af308de7c293c47ac4594 SHA-1: 527136643c935932c1bb1ae9c1cfa76401cea9c1 SHA-256: fa9d758fed5a844eda2a36924bfeebe807153dad4a88ad267bbd0ccaf42aceee
200 Risk Score

Malware Insights

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

The PDF contains multiple links to redirectors and known malicious infrastructure, disguised as offers for free game accounts and hacks. The document body and heuristics indicate a credential phishing or malware distribution lure, impersonating Microsoft. The embedded links likely lead to the download of a second-stage payload or a phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9890

Heuristics 5

  • 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.
  • 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: https://netcdn.tw/app/431946152/free-roblox-accounts-2021-bugmenot-game-hack.
  • 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 https://netcdn.tw/app/431946152/free-roblox-accounts-2021-bugmenot-game-hack In PDF document text
    • http://pustaka-smpn3tpi.com/repository/coin-master-twitter-free-spins_GM406889139.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/hacks-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/roblox-executor-free_GM431946152.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/free-daily-spin-coin-master-game_GM406889139.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com//repository/free-robux-script_GM431946152.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com//repository/coin-master-free-coins_GM406889139.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/coin-master-free-2021-spin-link-today_GM406889139.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/roblox-report-hacker_GM431946152.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/coin-master-gold-cards-hack-english_GM406889139.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/free-spins-and-coins-coin-master-links_GM406889139.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/roblox-lawsuit_GM431946152.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/minecraft-free-download-laptop_GM479516143.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/how-can-u-get-free-robux_GM431946152.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com//repository/smart-lodhi-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/coin-master-coins_GM406889139.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com//repository/hack-coin-master-game-download_GM406889139.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/free-robux-today_GM431946152.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/huskybuckscom-free-robux_GM431946152.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com//repository/how-to-hack-and-get-free-robux_GM431946152.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com//repository/coin-master-hacks-for-free-spins_GM406889139.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_004_off00004f9a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4F9A 25400 bytes
SHA-256: 81e6f553e615060d8205d849679c6dcbbc110ff48bbe1abb01f971e682f0217b
font_01_sfnt_off000089b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x89B3 19144 bytes
SHA-256: 89f5bebbc3f7cbe4072fa23b349099576d3ab9457ed1f30b48e326d86d549fcd

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