Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f5518ba1d50203e…

MALICIOUS

PDF

34.6 KB Created: 2021-07-05 09:24:41 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 1bed53f5d55c1d4ee390810eed524a7d SHA-1: ade27328cc07940a2cfbfa65b938bdf7896faff6 SHA-256: 5f5518ba1d50203e2110657a6609ec2c1c1508330302e3450e1cb444d2ca4df3
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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.
  • PDF links to a 'free generator / game hack' redirector high 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.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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/406889139/how-to-get-free-spins-in-coin-master-game-hack PDF link annotation
    • http://library.acehresearch.org/repository/cheat-engine-hack-roblox-rpg_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/free-spins-coin-master-links-2021_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/hacks-client-for-roblox-wild-revolvers_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/coin-master-hack-without-verification_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/coin-master-offline-hack_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/how-to-get-more-robux_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/fbchampion-com_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/coin-master-free-coins-link_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/coin-master-hack-cheat-engine_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/commande-lua-roblox-cheat_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/roblox-boost-com-hack_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/free-robux-hack-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/free-robux-no-human-verify_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/how-to-get-free-robux-as-a-kid_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/rbx-claim_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/cheat-codes-for-coin-master_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/roblox-ios-hack-no-jailbreak_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/free-robux-link_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/free-robux-generator-2021_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/free-robux-no-scam_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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000030f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30F7 22964 bytes
SHA-256: 55d0345520801453d097f25b763f5e16b76b8c29d17b70bd4a7e4c7bc4f7dfbf
font_01_sfnt_off0000648a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x648A 18336 bytes
SHA-256: 11de4304e4fdf887d410d1e4a25cee46ae29c04a9263dbbe12b650d8207992b4

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