Malicious PDF — malware analysis report

Static analysis result for SHA-256 d906f68ca475d00a…

MALICIOUS

PDF

33.2 KB Created: 2021-07-06 14:00:48 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 721ef824371ebfb528bcc4e5155fa364 SHA-1: d9a70e90f12aece1446b3143c20d5006d9d585ab SHA-256: d906f68ca475d00a475916eec25696e203fbad335fac69b12137265d1e0a09d8
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 http://netcdn.tw/app/431946152/robux-prices-game-hack PDF link annotation
    • http://shoruq.sch.ae/userfiles/files/free-robux-no-verification-no-survey_GM431946152.pdfIn PDF document text
    • http://shoruq.sch.ae/userfiles/files/buy-robux-free_GM431946152.pdfIn PDF document text
    • http://shoruq.sch.ae/userfiles/files/how-to-get-free-hair-for-avatar-in-roblox_GM431946152.pdfIn PDF document text
    • http://shoruq.sch.ae/userfiles/files/op-rewards-free-robux_GM431946152.pdfIn PDF document text
    • http://shoruq.sch.ae/userfiles/files/free-spins-coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://shoruq.sch.ae/userfiles/files/how-to-get-free-robux-credit_GM431946152.pdfIn PDF document text
    • http://shoruq.sch.ae/userfiles/files/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://shoruq.sch.ae/userfiles/files/code-for-robux-free-2021-4th-of-july_GM431946152.pdfIn PDF document text
    • http://shoruq.sch.ae/userfiles/files/coin-master-free-spin-link-today-2021_GM406889139.pdfIn PDF document text
    • http://shoruq.sch.ae/userfiles/files/free-ways-to-get-robux_GM431946152.pdfIn PDF document text
    • http://shoruq.sch.ae/userfiles/files/roblox-free-draw-bot_GM431946152.pdfIn PDF document text
    • http://shoruq.sch.ae/userfiles/files/how-to-get-free-robux-without-verification-2021_GM431946152.pdfIn PDF document text
    • http://shoruq.sch.ae/userfiles/files/how-to-get-free-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://shoruq.sch.ae/userfiles/files/free-roblox-developers_GM431946152.pdfIn PDF document text
    • http://shoruq.sch.ae/userfiles/files/roblox-free-roblox-cards-no-human-verification_GM431946152.pdfIn PDF document text
    • http://shoruq.sch.ae/userfiles/files/minecraft-building-hacks_GM479516143.pdfIn PDF document text
    • http://shoruq.sch.ae/userfiles/files/free-robux-games_GM431946152.pdfIn PDF document text
    • http://shoruq.sch.ae/userfiles/files/free-roblox-toy-codes-2021_GM431946152.pdfIn PDF document text
    • http://shoruq.sch.ae/userfiles/files/roblox-controversy_GM431946152.pdfIn PDF document text
    • http://shoruq.sch.ae/userfiles/files/how-to-get-free-robux-on-roblox-without-buying-anything_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
font_00_sfnt_off00002dab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2DAB 21596 bytes
SHA-256: 78491b1f3ef00399b137693b08fdf3f8112b1f713bfc4802eec21397216030d3
font_01_sfnt_off00005d3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D3B 18824 bytes
SHA-256: 917b2b595c85e899e08b6a40e7434d48f59ea0235caebc632e03070b6eb7ba4e

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