Malicious PDF — malware analysis report

Static analysis result for SHA-256 70aa60f7f8fc107c…

MALICIOUS

PDF

31.1 KB Created: 2021-07-20 14:24:22 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: ba3b21fbe42619bbb55c471e3e9b6916 SHA-1: 0978a0d03a8dcbbf2e78f97ff6682a85e894205d SHA-256: 70aa60f7f8fc107c63e6e8f8e7e31e3b5c945422b8d77c577867fb33df0d73a4
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains multiple links to known malicious redirector infrastructure, specifically advertising a "Coin Master Free Blogspot" game hack. The document body and heuristics indicate a lure to click these links, which likely leads to further malicious content or exploits. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier clean score 0.0850

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 http://netcdn.tw/app/406889139/coin-master-free-blogspot-game-hack In PDF document text
    • http://aks-akk.ac.id/html/perpusakk/repository/how-do-u-get-free-robux_GM431946152.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_off0000231d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x231D 23292 bytes
SHA-256: 4f44cec0f04a71ce174888aa59b2d1013c4234d0ea1cfe59dd6afb5613cb59f4
font_01_sfnt_off000057aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x57AA 18464 bytes
SHA-256: 3d1506adb004325b5ad849f11167115e1f90dbd1428f7e6d98779d75984a0c30

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