Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a98cac801028e7b…

MALICIOUS

PDF

41.4 KB Created: 2021-05-12 13:29:43 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: f97504bbfcfd7f31c154b38c035bd846 SHA-1: c3c0f32f77fc2a5c96519bbc3efef9c4f0b2d4e2 SHA-256: 4a98cac801028e7b36e996f020502c6910813803b3f3f3df7d4d0584b9e92cfc
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, including a primary link to a known malicious redirector. Heuristics indicate a 'game hack' lure and a link farm, suggesting the document's purpose is to drive traffic to potentially malicious sites. The ML classifier strongly supports the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 5

  • 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.
  • 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.
  • 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 https://netcdn.xyz/app/431946152/robux-free-co-game-hack In PDF document text
    • http://huebner-baustoffe.de/images/free-robux-codes-no-human-verification_GM431946152.pdfIn PDF document text
    • http://huebner-baustoffe.de/images/free-robux-generator-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://huebner-baustoffe.de/images/free-robux-with-no-human-verification_GM431946152.pdfIn PDF document text
    • http://huebner-baustoffe.de/images/best-free-robux-sites_GM431946152.pdfIn PDF document text
    • http://huebner-baustoffe.de/images/coin-master-daily-free-spins-blogspot_GM406889139.pdfIn PDF document text
    • http://huebner-baustoffe.de/images/daily-free-spin-coin-master-link_GM406889139.pdfIn PDF document text
    • http://huebner-baustoffe.de/images/how-can-i-get-robux_GM431946152.pdfIn PDF document text
    • http://huebner-baustoffe.de/images/free-robux-gen_GM431946152.pdfIn PDF document text
    • http://huebner-baustoffe.de/images/free-roblox-intros_GM431946152.pdfIn PDF document text
    • http://huebner-baustoffe.de/images/how-to-get-free-robux-for-free_GM431946152.pdfIn PDF document text
    • http://huebner-baustoffe.de/images/free-roblox-hack_GM431946152.pdfIn PDF document text
    • http://huebner-baustoffe.de/images/free-minecraft-hosting-24-7_GM479516143.pdfIn PDF document text
    • http://huebner-baustoffe.de/images/how-do-u-get-free-robux_GM431946152.pdfIn PDF document text
    • http://huebner-baustoffe.de/images/free-robux-no-survey-or-human-verification_GM431946152.pdfIn PDF document text
    • http://huebner-baustoffe.de/images/robux-free-gift-card-org-hack_GM431946152.pdfIn PDF document text
    • http://huebner-baustoffe.de/images/roblox-hacks-and-cheats_GM431946152.pdfIn PDF document text
    • http://huebner-baustoffe.de/images/coin-master-coin-link_GM406889139.pdfIn PDF document text
    • http://huebner-baustoffe.de/images/free-robux-codes-no-verification_GM431946152.pdfIn PDF document text
    • http://huebner-baustoffe.de/images/how-to-get-free-robux-on-phone-2021_GM431946152.pdfIn PDF document text
    • http://huebner-baustoffe.de/images/free-robux-websites-no-human-verification_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_off00004884.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4884 24600 bytes
SHA-256: 0dd2cf157dec532120ee1ddbea3cd2f1c2ae24c454178ac3ba7a1afcbdc954b4
font_01_sfnt_off00008028.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8028 18012 bytes
SHA-256: 3f1ded8a9c51e4f0f41c660fd84d3573ebe8f92a83837bcaa523a9614d650e73

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