Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff876527409db09a…

MALICIOUS

PDF

39.5 KB Created: 2021-05-21 07:48:54 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 8ec8bec459ecc7a872cda37b9ae96238 SHA-1: 522060704bc249aed40aad8471cedfe5b7d7b46a SHA-256: ff876527409db09a8248efa9e1ea67002bf4c3052c1e0790bb7c97c56dd25506
160 Risk Score

Malware Insights

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

The PDF contains multiple links to known malicious redirectors, specifically promoting 'free generators' and 'game hacks' for popular games. The document body and embedded URLs reinforce this lure, aiming to trick users into visiting malicious sites. The presence of embedded URLs and the nature of the lures suggest an attempt to exploit users' interest in free in-game items or cheats, likely leading to further malware downloads or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9476

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/431946152/how-to-make-a-group-on-roblox-for-free-game-hack In PDF document text
    • http://dopheide.be/images/free-promo-codes-roblox_GM431946152.pdfIn PDF document text
    • http://dopheide.be/images/coin-master-hacks_GM406889139.pdfIn PDF document text
    • http://dopheide.be/images/free-robux-obby-2021_GM431946152.pdfIn PDF document text
    • http://dopheide.be/images/coin-master-free-spins-2021-haktuts_GM406889139.pdfIn PDF document text
    • http://dopheide.be/images/coin-master-free-spins-link-today-instagram_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_off0000347a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x347A 30220 bytes
SHA-256: ae1c93dd8d3e3bf3f976751fa5274400b10fe28e08e9779b3115db80c49781b8
font_01_sfnt_off00007740.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7740 19020 bytes
SHA-256: 618aa5fa104ea73151876125e2b85ad7dcdc11323aacc6b5e0056594e37eb48c

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