Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a83acf182b80ddf…

MALICIOUS

PDF

30.0 KB Created: 2021-07-06 01:33:23 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: dd2265bd803807f9e6b58bdfb934a14f SHA-1: c57713188e1c7f9d8d2305855997343c87090c36 SHA-256: 6a83acf182b80ddf44c29795d5018b5a300796a0b069b3fa9f1f40809fa6ff1a
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for a malicious redirector link, specifically pointing to a "free generator / game hack" lure. The document body reinforces this by displaying a call-to-action phrase and the malicious URL. While no scripts were extracted, the presence of a malicious redirector strongly suggests the intent is to lead the user to a site that will likely download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier clean score 0.0054

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/twitter-coin-master-free-spins-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_001_off000018ef.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x18EF 22032 bytes
SHA-256: 88346035ea3ef16d201feeaafd2f415e193ffba7cec96a876c8c76c602e447cb
font_01_sfnt_off000049c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x49C1 2896 bytes
SHA-256: c1a618813a64314343402b2ec738fc11c4c912460a4c7ae3029924d2f9a229cd
font_02_sfnt_off000053a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x53A6 18336 bytes
SHA-256: ace8529003dd85c0f7dacf2c69051d6549971c35597209070ab220570a697a3f

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