Malicious PDF — malware analysis report

Static analysis result for SHA-256 81367d14ae66b698…

MALICIOUS

PDF

36.2 KB Created: 2021-05-23 18:09:03 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 8c6004cebd6b88450083dc921d47b81b SHA-1: 16114fb0b8f703ca671789cee70d9c0c0003883e SHA-256: 81367d14ae66b6986ba7dbcb5aa8aa8049a1c1a7730b5a459240b3fe853e2a4c
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors, disguised as game hacks and generators. The ML classifier also flagged this PDF as malicious. The embedded links likely lead to a second-stage download or exploit, aiming to compromise the user's system.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9492

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/479516143/minecraft-skins-free-girl-game-hack In PDF document text
    • http://per-bittner.de/images/coin-master-free-spins-link-october-2021_GM406889139.pdfIn PDF document text
    • http://per-bittner.de/images/how-do-you-hack-roblox_GM431946152.pdfIn PDF document text
    • http://per-bittner.de/images/coin-master-free-coins-and-spins-daily-summary_GM406889139.pdfIn PDF document text
    • http://per-bittner.de/images/how-to-get-free-robux-youtube_GM431946152.pdfIn PDF document text
    • http://per-bittner.de/images/how-to-get-free-coins-on-coin-master-2021_GM406889139.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_off000035a3.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x35A3 24912 bytes
SHA-256: d419acecc874120191bd202aa1f069f1587131115f0e344e5c2a33bf68d18102
font_01_sfnt_off00006df0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6DF0 17812 bytes
SHA-256: 7ce5d1bffc067a7697c6659b9f16d2693dfb8cdcb2edfb00fbdf7ce9282af41c

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