Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e928e7a6b4998ae…

MALICIOUS

PDF

44.6 KB Created: 2021-06-03 13:42:04 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 09fdec98cf60f8918b85821a7f365ddf SHA-1: fa024d4626be57ec8fee9a5c776665faf5272f7e SHA-256: 5e928e7a6b4998ae932c432faafb77f5a837b8f37f5b8f83974b766fd81015ed
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating malicious redirector links, specifically targeting users with lures for game hacks and generators. The document body and embedded URLs point towards a malicious redirector infrastructure designed to lead users to potentially harmful content. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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.online/app/406889139/coinmaster-spin-ml-game-hack In PDF document text
    • http://perpus.masda.ac.id//repository/hack-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/minecraft-ore-finder-mod_GM479516143.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/free-robux-only-username-no-human-verification_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/roblox-robux-generator-http-freerobuxgenerator-xyz_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/coin-master-game-hacking-tricks_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/how-do-i-get-free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/free-face-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/best-free-minecraft-server-hosting-reddit_GM479516143.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/robux-com-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/how-to-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/free-ways-to-get-robux_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/coin-master-free-spins-2021-generator_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/free-coin-master-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/synapse-roblox-free_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/coin-master-free-rare-cards_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/free-spins-coin-master-daily_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/coin-master-free-spins-hack-without-human-verification_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/pokemon-go-free-to-play-guide_GM1094591345.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/free-coins-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/rewards-robux_GM431946152.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_off0000517f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x517F 25572 bytes
SHA-256: 164517b69931375e5a9a2e958f895013c6751416a7aa1e90bf620fddc9b5c070
font_01_sfnt_off00008c7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C7B 18056 bytes
SHA-256: 064134117864f7541fed544d899877d9437d618d81879e9055ccf00f3d226253

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