Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2f1f3c8d5816e49…

MALICIOUS

PDF

44.1 KB Created: 2021-05-17 15:32:43 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 1b16e9bb2cc3830eb54a4f0a95153442 SHA-1: 8f75c4edf5e43c1c6460ef88b491fce7684e6c1d SHA-256: b2f1f3c8d5816e497236fb4ef70b9f427caca755e7185165367e87c02276959e
220 Risk Score

Malware Insights

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

The PDF contains multiple links to known malicious redirectors and SEO link farms, disguised as game hack generators and free currency offers. The heuristic firings indicate a lure for users to click these links, which likely leads to further malicious content or downloads. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9648

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/level-coin-game-hack In PDF document text
    • http://gomelavto.by/images/get-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://gomelavto.by/images/download-coin-master-hack-apk_GM406889139.pdfIn PDF document text
    • http://gomelavto.by/images/minecraft-hacks-xbox_GM479516143.pdfIn PDF document text
    • http://gomelavto.by/images/how-to-get-free-golden-card-in-coin-master_GM406889139.pdfIn PDF document text
    • http://gomelavto.by/images/free-robux-no-human-verification-generator_GM431946152.pdfIn PDF document text
    • http://gomelavto.by/images/roblox-fun-com-free-robux_GM431946152.pdfIn PDF document text
    • http://gomelavto.by/images/coin-master-free-redeem-code_GM406889139.pdfIn PDF document text
    • http://gomelavto.by/images/minecraft-bedrock-free-download-pc_GM479516143.pdfIn PDF document text
    • http://gomelavto.by/images/free-robux-instantly_GM431946152.pdfIn PDF document text
    • http://gomelavto.by/images/coin-master-hack-spins-free_GM406889139.pdfIn PDF document text
    • http://gomelavto.by/images/coin-master-free-coins-app_GM406889139.pdfIn PDF document text
    • http://gomelavto.by/images/how-to-get-free-robux-youtube_GM431946152.pdfIn PDF document text
    • http://gomelavto.by/images/coin-master-free-spin-link-list_GM406889139.pdfIn PDF document text
    • http://gomelavto.by/images/coin-master-hack-without-human-verification-india_GM406889139.pdfIn PDF document text
    • http://gomelavto.by/images/robux-free-online_GM431946152.pdfIn PDF document text
    • http://gomelavto.by/images/minecraft-beta-free_GM479516143.pdfIn PDF document text
    • http://gomelavto.by/images/coin-master-hack-tuts_GM406889139.pdfIn PDF document text
    • http://gomelavto.by/images/free-robux-earn_GM431946152.pdfIn PDF document text
    • http://gomelavto.by/images/coin-master-tricks-and-hacks_GM406889139.pdfIn PDF document text
    • http://gomelavto.by/images/coin-master-app-for-free-spins_GM406889139.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_off000047f3.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x47F3 25536 bytes
SHA-256: f658daf517d63ad713cb9ed553090b2fd222d97b02c372c20a0ed07420a27f78
font_01_sfnt_off000082ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x82AB 2896 bytes
SHA-256: c1a618813a64314343402b2ec738fc11c4c912460a4c7ae3029924d2f9a229cd
font_02_sfnt_off00008c91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C91 17400 bytes
SHA-256: cd90f0e27c97aec7875c8622f96aaddce3568dbf304674e2b8a10a5ddcea6088

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