Malicious PDF — malware analysis report

Static analysis result for SHA-256 c26b275f4ddded73…

MALICIOUS

PDF

45.3 KB Created: 2021-05-12 11:30:51 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 273594974f6a0453a3341d6230f89774 SHA-1: 7ae7f424193cc78c159a129a15871f2a929b0362 SHA-256: c26b275f4ddded737d9b0a81dc2909c0f167c16573b09cb059db4c6b04a0d1bc
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external sites, many of which are identified as malicious redirectors or part of a link farm. The document body and heuristics indicate a lure for game-related cheats and hacks, likely to lead users to phishing or malware download sites. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9551

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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.xyz/app/406889139/coin-master-hacks-that-actually-work-game-hack In PDF document text
    • http://mohacad.hu/images/free-spins-link-in-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://mohacad.hu/images/free-daily-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://mohacad.hu/images/free-coins-and-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://mohacad.hu/images/free-robux-gift-card_GM431946152.pdfIn PDF document text
    • http://mohacad.hu/images/free-coin-master-spins_GM406889139.pdfIn PDF document text
    • http://mohacad.hu/images/coin-master-free-coins-and-spins_GM406889139.pdfIn PDF document text
    • http://mohacad.hu/images/minecraft-bedrock-edition-download-pc-free_GM479516143.pdfIn PDF document text
    • http://mohacad.hu/images/roblox-studio-free-robux_GM431946152.pdfIn PDF document text
    • http://mohacad.hu/images/coin-master-deals_GM406889139.pdfIn PDF document text
    • http://mohacad.hu/images/minecraft-nintendo-switch-digital-code-free_GM479516143.pdfIn PDF document text
    • http://mohacad.hu/images/how-to-hack-roblox-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://mohacad.hu/images/daily-free-spin-and-coin_GM406889139.pdfIn PDF document text
    • http://mohacad.hu/images/minecraft-for-free-on-phone_GM479516143.pdfIn PDF document text
    • http://mohacad.hu/images/coin-master-hack-app-for-iphone_GM406889139.pdfIn PDF document text
    • http://mohacad.hu/images/how-do-i-get-free-robux_GM431946152.pdfIn PDF document text
    • http://mohacad.hu/images/best-free-minecraft-servers_GM479516143.pdfIn PDF document text
    • http://mohacad.hu/images/how-to-get-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • http://mohacad.hu/images/roblox-free-robux-hack_GM431946152.pdfIn PDF document text
    • http://mohacad.hu/images/100-free-coin-master-spins_GM406889139.pdfIn PDF document text
    • http://mohacad.hu/images/how-to-get-free-roebucks-on-roblox_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004818.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4818 25268 bytes
SHA-256: 4730a4f10dd60c1139d7ba70de772011dcad573c1bceff5961dd45acfbfefe6b
font_01_sfnt_off000082a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x82A1 3400 bytes
SHA-256: 4b3e0f36ad1e0c7e3ea5c178fd2b4f097d1e01575fc6a4101a8b520db34dfe07
font_02_sfnt_off00008dcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8DCB 18472 bytes
SHA-256: 8403d92330cb41559737ed1496c4c5894a050c2f7b8d5bf65f27834ff4ec6c0c

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