Malicious PDF — malware analysis report

Static analysis result for SHA-256 a957aabb9f823203…

MALICIOUS

PDF

44.6 KB Created: 2021-05-19 07:13:42 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 37118fba8f362e7a9bc9f978c3e9d1f1 SHA-1: 22c6afc7c0e7b09bee58060c4ee1394f7363d2bd SHA-256: a957aabb9f82320326704fb8e648fe92ec93438e6d924ff2f3ff320716d8c46b
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 0.9980

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/how-to-hack-coin-master-game-without-root-game-hack PDF link annotation
    • http://whiteyaknepal.com/userfiles/files/free-spins-and-coins-coin-master_GM406889139.pdfIn PDF document text
    • http://whiteyaknepal.com/userfiles/files/minecraft-hacks-ps4_GM479516143.pdfIn PDF document text
    • http://whiteyaknepal.com/userfiles/files/how-to-get-free-hair-in-roblox_GM431946152.pdfIn PDF document text
    • http://whiteyaknepal.com/userfiles/files/free-robux-no-verification-required_GM431946152.pdfIn PDF document text
    • http://whiteyaknepal.com/userfiles/files/is-there-a-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://whiteyaknepal.com/userfiles/files/free-gold-cards-for-coin-master_GM406889139.pdfIn PDF document text
    • http://whiteyaknepal.com/userfiles/files/how-to-get-free-spins-on-coin-master-iphone_GM406889139.pdfIn PDF document text
    • http://whiteyaknepal.com/userfiles/files/freerobux-hack-us_GM431946152.pdfIn PDF document text
    • http://whiteyaknepal.com/userfiles/files/coin-master-free-spins-and-cards_GM406889139.pdfIn PDF document text
    • http://whiteyaknepal.com/userfiles/files/coin-master-app-hack_GM406889139.pdfIn PDF document text
    • http://whiteyaknepal.com/userfiles/files/coin-master-mod_GM406889139.pdfIn PDF document text
    • http://whiteyaknepal.com/userfiles/files/how-to-earn-free-robux_GM431946152.pdfIn PDF document text
    • http://whiteyaknepal.com/userfiles/files/free-spins-and-coins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://whiteyaknepal.com/userfiles/files/get-free-spins-coin-master-link_GM406889139.pdfIn PDF document text
    • http://whiteyaknepal.com/userfiles/files/coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • http://whiteyaknepal.com/userfiles/files/coin-master-hack-2021-no-human-verification_GM406889139.pdfIn PDF document text
    • http://whiteyaknepal.com/userfiles/files/how-to-get-free-robux-without-verification-2021_GM431946152.pdfIn PDF document text
    • http://whiteyaknepal.com/userfiles/files/coin-master-unlimited-spin-hack_GM406889139.pdfIn PDF document text
    • http://whiteyaknepal.com/userfiles/files/robux-games_GM431946152.pdfIn PDF document text
    • http://whiteyaknepal.com/userfiles/files/how-to-get-free-robux-easy-hack_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_003_off00004caf.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4CAF 30556 bytes
SHA-256: bb838775d53e4dcd3b60de4dc88a4258ace5d5db391cb681eb0a7be9c3633940
font_01_sfnt_off00008b5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B5F 18644 bytes
SHA-256: 5b0b6c654ae884b7a351bf787d45d43166c87cb8727a18cb45f58fffc41445c6

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