Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5fb881563f1df5e…

MALICIOUS

PDF

36.7 KB Created: 2021-05-21 18:31:35 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 3b41ea72493e31d6928ea48bae6ffe8d SHA-1: 4be67eb16500379666d77b28f5b778b5382fd6e9 SHA-256: c5fb881563f1df5e190cfe7caf016eebac4389494502a282a0175b3bce304ce8
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links that redirect to known malicious infrastructure, specifically promoting game hacks and generators. The document body and heuristics indicate a lure for free game resources, which is a common social engineering tactic. The embedded links likely lead to further malicious content or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9447

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 https://netcdn.xyz/app/406889139/free-links-for-coin-master-game-hack In PDF document text
    • http://gamixpaliwa.pl/images/coin-master-daily-free-spins-link-facebook_GM406889139.pdfIn PDF document text
    • http://gamixpaliwa.pl/images/how-to-change-roblox-username-for-free_GM431946152.pdfIn PDF document text
    • http://gamixpaliwa.pl/images/roblox-online-free-no-download_GM431946152.pdfIn PDF document text
    • http://gamixpaliwa.pl/images/how-do-u-get-free-robux_GM431946152.pdfIn PDF document text
    • http://gamixpaliwa.pl/images/coin-master-apk_GM406889139.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_off00003575.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3575 25248 bytes
SHA-256: f796b60e3a3303665415083ec4a50e8a87e4bd6b619a14d890f2b672be2f59d8
font_01_sfnt_off00006f88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6F88 17880 bytes
SHA-256: a04fca5b08559e76c7fc5751e50b7e5576d0693cd390b0db561ab022dd525d54

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