Malicious PDF — malware analysis report

Static analysis result for SHA-256 31e3ed3acb1a7d73…

MALICIOUS

PDF

44.4 KB Created: 2021-06-11 03:29:57 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 3ac16c89341250dbd679052a57a2915f SHA-1: c5d08fd4146a5dbda5df68223aac630d624cc829 SHA-256: 31e3ed3acb1a7d7336a609266dcaecefdc971cfbeb3ee5e6e027a12c5d6580bc
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 0.9865

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 https://netcdn.tw/app/431946152/free-roblox-cheats-game-hack PDF link annotation
    • http://repository.unla.ac.id/repository/free-robux-without-downloading-apps_GM431946152.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/get-me-robux-for-free_GM431946152.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/how-to-get-free-robux-without-paying_GM431946152.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/coin-master-free-spins-no-verification_GM406889139.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/how-to-get-free-unlimited-robux_GM431946152.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/coin-master-spin-hack_GM406889139.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/how-to-get-minecraft-pe-for-free_GM479516143.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/claim-gg-free-robux_GM431946152.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/roblox-avatar-free_GM431946152.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/free-robux-working_GM431946152.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/robux-free-gift-card-org-hack_GM431946152.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/robux-sites_GM431946152.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/ispoofer-pokemon-go-free-key_GM1094591345.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/bux-gg-robux-free_GM431946152.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/coin-master-hack-online-no-human-verification_GM406889139.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/free-robux-codes_GM431946152.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/how-to-hack-and-get-free-robux_GM431946152.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/free-coins-for-flip-master-online_GM406889139.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/how-to-get-more-robux-for-free_GM431946152.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/coin-master-free-soins_GM406889139.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_off0000512c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x512C 24848 bytes
SHA-256: 994a11b2f1efc2795cb860d01c5b7cbabbda15c65a226fc1e616c936b3fe9ea0
font_01_sfnt_off00008a94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A94 18448 bytes
SHA-256: 5d03707f627d1eefefeda5ee668b35a4f672440298f00bdcd771f18b773bdceb

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