Malicious PDF — malware analysis report

Static analysis result for SHA-256 167fbf0a04fc98fc…

MALICIOUS

PDF

34.8 KB Created: 2021-06-19 09:25:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: d31c1eef746e410fb45de0a7474b24df SHA-1: fb4d730fab9f0f021472894472df9a4df72a1b6b SHA-256: 167fbf0a04fc98fc6bf4847e935c503c919562f07f22d040e6c147935abf8cc4
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded URLs that point to a known malicious redirector infrastructure, disguised as a generator for free game items. The document body and heuristics indicate a lure for game-related cheats, which is a common tactic for distributing malware or phishing for credentials. No scripts were extracted, but the primary attack vector appears to be directing users to malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector critical 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. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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.co/app/431946152/roblox-free-model-viruses-game-hack In PDF document text
    • https://www.armera.co.uk/uploads/files/files/how-to-get-free-robux-without-verifying-2021_GM431946152.pdfIn PDF document text
    • https://www.armera.co.uk/uploads/files/files/minecraft-windows-10-free-code_GM479516143.pdfIn PDF document text
    • https://www.armera.co.uk/uploads/files/files/hack-para-cs-go-roblox_GM431946152.pdfIn PDF document text
    • https://www.armera.co.uk/uploads/files/files/coin-master-free-spins-link-2021-twitter_GM406889139.pdfIn PDF document text
    • https://www.armera.co.uk/uploads/files/files/free-robux-codes_GM431946152.pdfIn PDF document text
    • https://www.armera.co.uk/uploads/files/files/free-coin-master-credit_GM406889139.pdfIn PDF document text
    • https://www.armera.co.uk/uploads/files/files/how-to-hack-with-codes-to-free-robux_GM431946152.pdfIn PDF document text
    • https://www.armera.co.uk/uploads/files/files/robux-for-offers_GM431946152.pdfIn PDF document text
    • https://www.armera.co.uk/uploads/files/files/free-links-for-free-coins-and-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.armera.co.uk/uploads/files/files/coin-master-hack-tool-download_GM406889139.pdfIn PDF document text
    • https://www.armera.co.uk/uploads/files/files/coin-master-hacks-that-actually-work_GM406889139.pdfIn PDF document text
    • https://www.armera.co.uk/uploads/files/files/best-way-to-get-robux_GM431946152.pdfIn PDF document text
    • https://www.armera.co.uk/uploads/files/files/free-robux-no-human-verification-no-survey_GM431946152.pdfIn PDF document text
    • https://www.armera.co.uk/uploads/files/files/robux-gift-card-free_GM431946152.pdfIn PDF document text
    • https://www.armera.co.uk/uploads/files/files/robuxmatchcom-free-robux_GM431946152.pdfIn PDF document text
    • https://www.armera.co.uk/uploads/files/files/how-to-get-free-roblox_GM431946152.pdfIn PDF document text
    • https://www.armera.co.uk/uploads/files/files/roblox-com-free-robux_GM431946152.pdfIn PDF document text
    • https://www.armera.co.uk/uploads/files/files/free-clothes-for-roblox-hack_GM431946152.pdfIn PDF document text
    • https://www.armera.co.uk/uploads/files/files/free-robux-no-human-verification-or-survey-or-download-2021_GM431946152.pdfIn PDF document text
    • https://www.armera.co.uk/uploads/files/files/is-there-a-way-to-get-free-robux_GM431946152.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
font_00_sfnt_off00003068.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3068 22288 bytes
SHA-256: 7977b9c0ce619dc42509a19c6f48d6937c83ffd536b6a34714ff7898e97a79cb
font_01_sfnt_off0000621d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x621D 19412 bytes
SHA-256: 5c071632e1e1c74ec74170570e1f6c0f8ded45c5714f77cc2b6f27bd65223166

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