Malicious PDF — malware analysis report

Static analysis result for SHA-256 751bf033237d39d0…

MALICIOUS

PDF

42.2 KB Created: 2021-05-16 03:55:55 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: f0caea942a747f2a4387706886ed5140 SHA-1: a90a753b24289abf1072b24ca23f373af2718e38 SHA-256: 751bf033237d39d0148a9df66b1d9c233d2dcc21b5d887bf34c15678e8fb1935
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 0.9971

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.xyz/app/431946152/robux-only-game-hack PDF link annotation
    • http://nod74.ru/images/how-do-you-get-free-roblox_GM431946152.pdfIn PDF document text
    • http://nod74.ru/images/free-robux-websites-that-actually-work_GM431946152.pdfIn PDF document text
    • http://nod74.ru/images/free-robux-hack_GM431946152.pdfIn PDF document text
    • http://nod74.ru/images/buy-robux-free_GM431946152.pdfIn PDF document text
    • http://nod74.ru/images/how-to-get-free-cards-on-coin-master_GM406889139.pdfIn PDF document text
    • http://nod74.ru/images/latest-coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • http://nod74.ru/images/how-to-get-minecraft-coins-for-free_GM479516143.pdfIn PDF document text
    • http://nod74.ru/images/minecraft-online-free-no-download_GM479516143.pdfIn PDF document text
    • http://nod74.ru/images/coin-master-free-spins-fb_GM406889139.pdfIn PDF document text
    • http://nod74.ru/images/coin-master-hack-tips_GM406889139.pdfIn PDF document text
    • http://nod74.ru/images/coin-master-free-spins-2021-haktuts_GM406889139.pdfIn PDF document text
    • http://nod74.ru/images/coin-master-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://nod74.ru/images/get-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • http://nod74.ru/images/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://nod74.ru/images/how-to-download-minecraft-for-free-on-pc_GM479516143.pdfIn PDF document text
    • http://nod74.ru/images/coin-master-free-spins-2021-hack_GM406889139.pdfIn PDF document text
    • http://nod74.ru/images/how-to-get-free-robux-easy-on-phone_GM431946152.pdfIn PDF document text
    • http://nod74.ru/images/www-roblox-com-robux-free_GM431946152.pdfIn PDF document text
    • http://nod74.ru/images/rich-free-roblox-accounts_GM431946152.pdfIn PDF document text
    • http://nod74.ru/images/2021-free-coin-master-spins_GM406889139.pdfIn PDF document text
    • https://discordIn 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_003_off000046af.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x46AF 26308 bytes
SHA-256: 78e77821c30e10c56fae384b6a9a8fbab2718b55d18043a2bb5fd3c7ee65855c
font_01_sfnt_off000082f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x82F1 18104 bytes
SHA-256: 835647ca3f0bcc9c34df60568ac9a35acac0655e7da8ad66dbd525e7cff734af

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