Malicious PDF — malware analysis report

Static analysis result for SHA-256 54a81cd2c535a542…

MALICIOUS

PDF

38.1 KB Created: 2021-05-22 12:36:11 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-12
MD5: ff502d827692068f9cc65e6b6688b464 SHA-1: 1a40917e6551c9a5f0e600f62776c1e0f124dad7 SHA-256: 54a81cd2c535a5427cbf0c149594c3b942e3db9fec0633e98579ac391b2805c5
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links pointing to a known malicious redirector infrastructure, specifically advertising a 'free generator / game hack'. The document body and embedded artifacts suggest a lure to trick users into visiting this malicious URL. No scripts were extracted from this sample, but the embedded links are sufficient to indicate a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier clean score 0.0076

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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/835599320/free-likes-for-tiktok-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_002_off00002c0b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2C0B 25784 bytes
SHA-256: cf586f825f7ffad6a2e7fa08fbe1899b82f8c1f542446d29f194373e395eb1fc
font_01_sfnt_off000067bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x67BB 4400 bytes
SHA-256: 7596b1772a829bb230e8a1ee359cd8bade90bf1d4cb66ab490cb293362c1c01e
font_02_sfnt_off0000766a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x766A 17456 bytes
SHA-256: 308920fe04ba02bee84e9df39862d70534e91875b9399095fdfb0b81d81483e5

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