Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9475893afacfc49…

MALICIOUS

PDF

34.2 KB Created: 2021-07-05 09:27:13 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 0782e26291490c78ec325c16a66c26fc SHA-1: c578e662dba162703b6476abc051a2569854f47c SHA-256: b9475893afacfc49df125e37dcb8e2ddc9205f293c79de69b607062ba4df429f
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains numerous links to external resources, including a primary link to a malicious redirector disguised as a game hack. The document body and heuristics indicate a lure for users seeking game cheats or generators, which is a common tactic for distributing malware or conducting phishing. The presence of multiple links to similar content suggests a link farm designed to host malicious payloads or redirect to them.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/406889139/coin-master-34-4-hack-download-game-hack In PDF document text
    • http://libsmpn1balongpo.sch.id/repository/games-on-roblox-that-vip-servers-are-free_GM431946152.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id//repository/coin-master-2021_GM406889139.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id//repository/free-robux-websites-that-actually-work_GM431946152.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id//repository/coin-master-in-app-purchase-hack_GM406889139.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id//repository/how-to-download-minecraft-for-free-ios_GM479516143.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id//repository/what-do-roblox-points-do_GM431946152.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id/repository/how-to-hack-roblox-players-2021_GM431946152.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id/repository/spped-hack-2021-november-for-roblox-the-last-avatar_GM431946152.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id//repository/get-free-robux-today_GM431946152.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id//repository/coin-master-free-pet-food-links_GM406889139.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id//repository/coin-master-free-spins-link-without-human-verification_GM406889139.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id//repository/coin-master-spin-link-hack_GM406889139.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id//repository/pokemon-go-free-vs-ultra_GM1094591345.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id//repository/free-robux-generator-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id//repository/coin-master-daily-free-spins-link-facebook_GM406889139.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id//repository/free-robux-by-watching-ads_GM431946152.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id//repository/free-spin-codes-coin-master_GM406889139.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id//repository/moonactive-free-spins_GM406889139.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id/repository/hacking-apps-roblox_GM431946152.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id/repository/roblox-skin-snake-free_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_002_off00002e96.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2E96 22628 bytes
SHA-256: 5c89fbc8e688e4dabfb9d553374369708a51f2afde811b66b5eec9647a3b797b
font_01_sfnt_off00006143.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6143 18820 bytes
SHA-256: 95d9a4ff6578ddbc8256c368f788a600221936c4ac4fa8ddd89b69082de0302d

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