Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d670af115be1f7d…

MALICIOUS

PDF

45.2 KB Created: 2021-05-10 12:01:17 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 587d7a40b1682b235390938e3c37c568 SHA-1: 431cbc86a9d770501351d25f48cfbe903ca37973 SHA-256: 1d670af115be1f7d0d45e5f26857ef3056c71780ca71b1d0c2e2b7de0130f724
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains multiple links to a URL associated with malicious redirector infrastructure, specifically promoting a 'Coin Master Hack'. The heuristic firings indicate that this is a lure for game hacks and potentially malicious redirects. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to trick the user into downloading a secondary payload.

Machine Learning

  • Nyx PDF Classifier clean score 0.0115

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/coin-master-hack-spins-apk-download-game-hack In PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00003468.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3468 27180 bytes
SHA-256: 66af1a265c4902d49fa4989f7218f90b788b40442e96b5987cd22ec340056dd6
font_01_sfnt_off000072ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x72AC 2840 bytes
SHA-256: 3fb127b764b9d10f5525bc4de5ec8316de704409ccb0cf21cff3ad8a30d11676
font_02_sfnt_off00007c59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7C59 7332 bytes
SHA-256: d811e0aca85f3b94c42cd1240eec68b8eb378f3d8be5e408d3f6abd0f11f834d
font_03_sfnt_off00008e72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E72 18472 bytes
SHA-256: 791253267e47a56e08c5233673e0527cc39705ce663f368d2087110d8ca61f39

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