Malicious PDF — malware analysis report

Static analysis result for SHA-256 7155e3f1b38b7ead…

MALICIOUS

PDF

38.9 KB Created: 2021-05-10 11:01:54 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-07-13
MD5: ffc8436568fc7e144adff36f7724d846 SHA-1: a899e2cb972610edbb43f533a8a751cfa4457490 SHA-256: 7155e3f1b38b7ead312747469c34e0658f206385d499c7eaad8796b8146d0bb4
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links that redirect to malicious infrastructure, specifically advertising a 'free generator / game hack'. The document body also contains text and a button lure related to downloading, reinforcing the phishing attempt. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier clean score 0.0127

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/coinmasterfreespins-game-hack In PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000319b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x319B 25104 bytes
SHA-256: cb8bed6eea496713a0315a0b46cfeaa44f923ea3aa6fcc4e3b56d6a15b077004
font_01_sfnt_off00006b5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B5F 3380 bytes
SHA-256: 1dd933c112880b232546f3aab6a17784a8f412d39fd551cc6eb31c5a04c3ce57
font_02_sfnt_off00007747.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7747 17980 bytes
SHA-256: 48872130680f0d6309128a4b322cbb0730700ec4544966fd5aa3d357de7636d5

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