Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c54b4c37bb40aa9…

MALICIOUS

PDF

34.8 KB Created: 2021-07-03 21:01:13 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: b2146950be6251553c81b9ddfedced9d SHA-1: 0731531ecc1e360a934b3e09c1ce3bdb49543e92 SHA-256: 2c54b4c37bb40aa9b471f34adadcfc85b3d9706089dc3a9f263cff84003d62e3
240 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document contains numerous links to external websites, many of which are hosted on domains associated with malicious redirectors and SEO link farms. The document body and heuristics indicate a lure for game hacks and free currency, suggesting the intent is to drive users to potentially malicious sites that may host malware or phishing content. The ML classifier strongly supports the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • 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.
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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/what-is-coin-master-app-game-hack In PDF document text
    • http://library.darmaagung.ac.id/repository/coin-master-2021-free-spins_GM406889139.pdfIn PDF document text
    • http://library.darmaagung.ac.id/repository/how-to-hack-coin-master-game_GM406889139.pdfIn PDF document text
    • http://library.darmaagung.ac.id//repository/coin-master-free-spins-link-today-new-2021_GM406889139.pdfIn PDF document text
    • http://library.darmaagung.ac.id/repository/free-robux-and-limiteds-hack_GM431946152.pdfIn PDF document text
    • http://library.darmaagung.ac.id//repository/where-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://library.darmaagung.ac.id/repository/free-coin-link-for-coin-master_GM406889139.pdfIn PDF document text
    • http://library.darmaagung.ac.id/repository/free-robux-robuxgg_GM431946152.pdfIn PDF document text
    • http://library.darmaagung.ac.id/repository/free-pet-food-for-coin-master_GM406889139.pdfIn PDF document text
    • http://library.darmaagung.ac.id/repository/free-robux-apps-that-work_GM431946152.pdfIn PDF document text
    • http://library.darmaagung.ac.id/repository/coin-master-hack-version-33-2_GM406889139.pdfIn PDF document text
    • http://library.darmaagung.ac.id//repository/bad-minecraft-free_GM479516143.pdfIn PDF document text
    • http://library.darmaagung.ac.id/repository/coin-master-hack-apk-ios_GM406889139.pdfIn PDF document text
    • http://library.darmaagung.ac.id/repository/roblox-game-free-download_GM431946152.pdfIn PDF document text
    • http://library.darmaagung.ac.id/repository/report-roblox-hacker_GM431946152.pdfIn PDF document text
    • http://library.darmaagung.ac.id/repository/how-to-hack-coin-master-cheat-engine_GM406889139.pdfIn PDF document text
    • http://library.darmaagung.ac.id/repository/how-to-hack-roblox-accounts-for-robux_GM431946152.pdfIn PDF document text
    • http://library.darmaagung.ac.id/repository/light-pack-roblox-mining-simulator-free_GM431946152.pdfIn PDF document text
    • http://library.darmaagung.ac.id/repository/free-robux-fast_GM431946152.pdfIn PDF document text
    • http://library.darmaagung.ac.id/repository/free-hair-roblox-2021_GM431946152.pdfIn PDF document text
    • http://library.darmaagung.ac.id/repository/roblox-health-hack-cheat-engine-64_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_off0000312c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x312C 23004 bytes
SHA-256: 217ba2d65ac8f8de54a79f8a014c334b24e42ac11a364abc995fbdff0e9d8382
font_01_sfnt_off000064ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64EA 18372 bytes
SHA-256: f79d9c035a1551b94357c3965ae3dcfcb493fedbf82fb2bf8e4d4d60176c4376

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