Malicious PDF — malware analysis report

Static analysis result for SHA-256 faa0cec9d100f8bd…

MALICIOUS

PDF

32.9 KB Created: 2021-05-22 21:09:07 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 36fd71aefa1c38f395527872ef93b13c SHA-1: 0bdca40a4f7cf8d9e85bb75ee1b9948a4827f3de SHA-256: faa0cec9d100f8bd56ec165396f4119793960a05913255111ed453e6a4fee6aa
130 Risk Score

Malware Insights

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

The PDF file contains a malicious redirector link disguised as a 'free generator / game hack' lure. The document body and heuristics indicate a workflow designed to trick the user into clicking the link, likely to download a second-stage payload. The primary IOC is the malicious URL used in the lure.

Machine Learning

  • Nyx PDF Classifier clean score 0.0718

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/835599320/tiktok-follower-bot-free-game-hack In 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_off000029d4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x29D4 23916 bytes
SHA-256: e2edf9dc000e1746fc571c6a2765fb29568bc0f9169c48856cc68658882566f9
font_01_sfnt_off00006058.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6058 17912 bytes
SHA-256: 36efea1239131c533f338518497dff1810050ff8e972c00fb3f35d249e370860

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