Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a618e991341d6d0…

MALICIOUS

PDF

38.2 KB Created: 2021-05-22 07:39:02 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 3660ea14a4c95dc51adfe0fc0c3bd7dc SHA-1: 3a9bbcc192c82f9d37ea63316304cc3bdc0d5c4d SHA-256: 8a618e991341d6d01904b0dbfa396722a14965287a7177073788bc71f6b562c2
240 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF document contains multiple heuristics indicating malicious intent, including links to known malicious redirectors and a fake CAPTCHA lure designed to trick users into executing further actions. The document body and embedded URLs suggest a phishing attempt related to game currency generators, impersonating brands to increase credibility. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9407

Heuristics 6

  • 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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://netcdn.xyz/app/431946152/how-to-get-free-robux-without-human-verification-game-hack.
  • 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-get-free-robux-without-human-verification-game-hack In PDF document text
    • http://tuyensinh.utc2.edu.vn/uploads/img/files/rbx-robux_GM431946152.pdfIn PDF document text
    • http://tuyensinh.utc2.edu.vn/uploads/img/files/how-to-buy-robux-for-free_GM431946152.pdfIn PDF document text
    • http://tuyensinh.utc2.edu.vn/uploads/img/files/free-spin-today-coin-master_GM406889139.pdfIn PDF document text
    • http://tuyensinh.utc2.edu.vn/uploads/img/files/pokemon-go-free-stardust_GM1094591345.pdfIn PDF document text
    • http://tuyensinh.utc2.edu.vn/uploads/img/files/robloxmatchcom-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_off0000316a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x316A 28188 bytes
SHA-256: 4f8202236642db47fc1f3a9d9c33c3e236df0612136888ca7f31ca3ec718659e
font_01_sfnt_off00007112.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7112 19388 bytes
SHA-256: c7994a70f951e7a274445218605a0e5dad46067da7d3a89c75279f94e76bcfde

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