Malicious PDF — malware analysis report

Static analysis result for SHA-256 b35f553cffa5e38e…

MALICIOUS

PDF

44.0 KB Created: 2021-05-14 20:31:13 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 3b364cadfb43b851f84127c5cf51bd33 SHA-1: 307bbca8fc96bfaab2ba7d7fcd6bd0113da30f81 SHA-256: b35f553cffa5e38e6f377ac2437b4a43421536ec2d95395aa84c75265dc25c6a
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are designed to appear as generators or hacks for popular games like Coin Master and Roblox. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of these links, suggesting a link farm or scam operation. While no scripts were explicitly extracted, the PDF structure and embedded URIs point towards a malicious lure designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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/coin-master-link-spin-game-hack PDF link annotation
    • http://bpbfloydinc.org/images/is-it-possible-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://bpbfloydinc.org/images/how-to-actually-get-free-robux_GM431946152.pdfIn PDF document text
    • http://bpbfloydinc.org/images/coin-master-free-spin-and-coins-links_GM406889139.pdfIn PDF document text
    • http://bpbfloydinc.org/images/free-roblox-money_GM431946152.pdfIn PDF document text
    • http://bpbfloydinc.org/images/free-robux-generator-no-survey_GM431946152.pdfIn PDF document text
    • http://bpbfloydinc.org/images/xray-hack_GM479516143.pdfIn PDF document text
    • http://bpbfloydinc.org/images/how-do-u-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://bpbfloydinc.org/images/blox-supply-free-robux_GM431946152.pdfIn PDF document text
    • http://bpbfloydinc.org/images/hacks-para-roblox_GM431946152.pdfIn PDF document text
    • http://bpbfloydinc.org/images/pig-master-coin-master-free-spin_GM406889139.pdfIn PDF document text
    • http://bpbfloydinc.org/images/free-robux-no-human-verification-and-no-survey_GM431946152.pdfIn PDF document text
    • http://bpbfloydinc.org/images/how-to-make-a-minecraft-server-for-free-java_GM479516143.pdfIn PDF document text
    • http://bpbfloydinc.org/images/minecraft-hacks-for-2b2t_GM479516143.pdfIn PDF document text
    • http://bpbfloydinc.org/images/coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://bpbfloydinc.org/images/free-spins-and-coins-coin-master_GM406889139.pdfIn PDF document text
    • http://bpbfloydinc.org/images/can-u-get-free-robux_GM431946152.pdfIn PDF document text
    • http://bpbfloydinc.org/images/coin-master-hack-apk-april-12-2021_GM406889139.pdfIn PDF document text
    • http://bpbfloydinc.org/images/minecraft-windows-10-free-with-java_GM479516143.pdfIn PDF document text
    • http://bpbfloydinc.org/images/free-robux-without-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://bpbfloydinc.org/images/minecraft-modded-client_GM479516143.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_off00004b6a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B6A 31280 bytes
SHA-256: e44e2081089872321f905732d286f0f60bd47dac538f6bef58bf5208c8cdce1f
font_01_sfnt_off00008ac5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8AC5 17892 bytes
SHA-256: 7aa3b039b4dd2eaa3c78c28a8976d594c7bc5201e2dd003047650d51ef6c46d2

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