Malicious PDF — malware analysis report

Static analysis result for SHA-256 68a850b00fce9b4f…

MALICIOUS

PDF

49.8 KB Created: 2021-06-07 16:46:20 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 1a3605017bd09ef181dca9a22bec2b2b SHA-1: 767e2cbf2c09d6734647b0061183650e3b2f5c9f SHA-256: 68a850b00fce9b4f2039e380ae1c5fda9512935b5e22c5d6c7b182ace8787d56
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to redirectors and link farms, specifically targeting users interested in game hacks and free currency. The heuristic firings indicate a malicious redirector and a lure for game generators, strongly suggesting a phishing or scamming attempt. While no scripts were directly extracted, the PDF structure and embedded URLs point towards a malicious workflow designed to lead users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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.tw/app/431946152/roblox-hack-script-walkspeed-game-hack In PDF document text
    • http://sbm-nn.ru/images/how-to-get-free-robux-easy-no-download_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/how-to-get-free-coins-in-minecraft_GM479516143.pdfIn PDF document text
    • http://sbm-nn.ru/images/how-to-earn-free-robux_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/spin-and-coin-link_GM406889139.pdfIn PDF document text
    • http://sbm-nn.ru/images/2021-free-spins-coin-master-link_GM406889139.pdfIn PDF document text
    • http://sbm-nn.ru/images/minecraft-free-download-android-apk-014-0_GM479516143.pdfIn PDF document text
    • http://sbm-nn.ru/images/pubg-uc-generator_GM1330123889.pdfIn PDF document text
    • http://sbm-nn.ru/images/roblox-fun-com-free-robux_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/how-to-get-more-robux-for-free_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/get-free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/coin-master-free-spin-whatsapp-group_GM406889139.pdfIn PDF document text
    • http://sbm-nn.ru/images/how-to-hack-roblox_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/minecraft-windows-free_GM479516143.pdfIn PDF document text
    • http://sbm-nn.ru/images/minecraft-free-download-2021_GM479516143.pdfIn PDF document text
    • http://sbm-nn.ru/images/the-plaza-roblox-money-cheat_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/free-spins-and-coins-blogspot-coin-master_GM406889139.pdfIn PDF document text
    • http://sbm-nn.ru/images/roblox-adopt-me-hacks-2021_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/how-to-get-minecraft-for-free-on-ps4-2021_GM479516143.pdfIn PDF document text
    • http://sbm-nn.ru/images/how-to-actually-get-free-robux_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/earn-free-robux-on-roblox_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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00004e13.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4E13 27380 bytes
SHA-256: c47091928ec7919d74732e754a1a3ae20e11d32a62e2d9327f34b8d3d7d65e02
font_01_sfnt_off00008dac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8DAC 6768 bytes
SHA-256: fa93de321190668b294ff46149e4b98ac349b4fd022dcee9ecd964f7f59f3f9a
font_02_sfnt_off00009deb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9DEB 18952 bytes
SHA-256: 253fab835ec53a21575c9491a071456ad0450741f2c5f05d267ff804f3c0e57f

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