Malicious PDF — malware analysis report

Static analysis result for SHA-256 74e98ad277e733b4…

MALICIOUS

PDF

41.6 KB Created: 2021-05-13 10:41:01 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 4511bdd8530829a210406cce487c31f0 SHA-1: 2a796c0d53f75eed7f01aa850dcf1d425f65b554 SHA-256: 74e98ad277e733b4daff0e7d08b0b968ee997e2d208cdc294059ed14ad126d4a
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/406889139/corn-master-game-hack PDF link annotation
    • http://kishplus.ir/images/free-robux-obby_GM431946152.pdfIn PDF document text
    • http://kishplus.ir/images/how-to-get-free-robux-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://kishplus.ir/images/40-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://kishplus.ir/images/haktuts-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://kishplus.ir/images/free-robux-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • http://kishplus.ir/images/free-robux-no-human-verification-no-survey_GM431946152.pdfIn PDF document text
    • http://kishplus.ir/images/daily-free-spin-and-coin_GM406889139.pdfIn PDF document text
    • http://kishplus.ir/images/free-realistic-minecraft-texture-packs_GM479516143.pdfIn PDF document text
    • http://kishplus.ir/images/spins-gratis-coin-master-hoy_GM406889139.pdfIn PDF document text
    • http://kishplus.ir/images/roblox-online-free_GM431946152.pdfIn PDF document text
    • http://kishplus.ir/images/free-robux-just-enter-username-and-password_GM431946152.pdfIn PDF document text
    • http://kishplus.ir/images/coin-master-hack-ios-jailbreak_GM406889139.pdfIn PDF document text
    • http://kishplus.ir/images/links-for-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://kishplus.ir/images/coin-master-daily-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://kishplus.ir/images/how-to-get-free-spins-on-coin-master-without-waiting_GM406889139.pdfIn PDF document text
    • http://kishplus.ir/images/coin-master-free-spins-facebook_GM406889139.pdfIn PDF document text
    • http://kishplus.ir/images/free-robux-pin-codes_GM431946152.pdfIn PDF document text
    • http://kishplus.ir/images/coin-master-hack-software-download_GM406889139.pdfIn PDF document text
    • http://kishplus.ir/images/wurst-112-2_GM479516143.pdfIn PDF document text
    • http://kishplus.ir/images/coin-master-heaven-free-spins-link-2021_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_003_off00004a7e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A7E 24776 bytes
SHA-256: dd60a49d911f02673a819bb7389f6e6e1837d6b260e33c9742866b7721c6a432
font_01_sfnt_off000082ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x82AD 17428 bytes
SHA-256: bb7ddfb5eeb119ecc025e94c1b8f2696886702df12a5472958d742496d82a376

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