Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac132227c4c70351…

MALICIOUS

PDF

42.7 KB Created: 2021-05-19 11:44:51 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: baf580d6efd3c0046b53f6108edf1e00 SHA-1: 2b55d4d8da806b9930169c139ac6018f7cedbe91 SHA-256: ac132227c4c7035179ed70206dff853f2c345c43e9596be6f0ad790028b7ad06
182 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. It uses a password-protected-archive lure. 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 0.9971

Heuristics 6

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.xyz/app/431946152/how-can-you-get-free-robux-game-hack PDF link annotation
    • http://uristdona.ru/images/how-to-get-free-robux-fast_GM431946152.pdfIn PDF document text
    • http://uristdona.ru/images/free-robux-without-any-verification_GM431946152.pdfIn PDF document text
    • http://uristdona.ru/images/how-to-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://uristdona.ru/images/bux-life-free-robux_GM431946152.pdfIn PDF document text
    • http://uristdona.ru/images/how-to-get-free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • http://uristdona.ru/images/free-robux-gift-card-generator_GM431946152.pdfIn PDF document text
    • http://uristdona.ru/images/how-to-get-free-minecoins-in-minecraft_GM479516143.pdfIn PDF document text
    • http://uristdona.ru/images/robux-codes-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • http://uristdona.ru/images/haktuts-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • http://uristdona.ru/images/how-to-hack-roblox_GM431946152.pdfIn PDF document text
    • http://uristdona.ru/images/free-spins-coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://uristdona.ru/images/how-to-get-free-robux-com_GM431946152.pdfIn PDF document text
    • http://uristdona.ru/images/how-to-get-free-robux-for-free_GM431946152.pdfIn PDF document text
    • http://uristdona.ru/images/how-to-use-scripts-in-roblox-hack_GM431946152.pdfIn PDF document text
    • http://uristdona.ru/images/free-robux-generator-2021_GM431946152.pdfIn PDF document text
    • http://uristdona.ru/images/minecraft-free-demo_GM479516143.pdfIn PDF document text
    • http://uristdona.ru/images/is-there-any-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://uristdona.ru/images/how-to-get-free-robux-in-2021_GM431946152.pdfIn PDF document text
    • http://uristdona.ru/images/mcpe-master-unlimited-coins-hack-apk_GM406889139.pdfIn PDF document text
    • http://uristdona.ru/images/coin-master-root-hack_GM406889139.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
stream_003_off00004816.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4816 25604 bytes
SHA-256: 6427efb8744c8865db9e0752c53c52f32e2880ca07e332176ffd1a3eee14c774
font_01_sfnt_off00008340.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8340 18672 bytes
SHA-256: b25769fe22a84510cbe545ecc77c61068e90e31ebb29fb78564d629eaf3a10b0

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