Malicious PDF — malware analysis report

Static analysis result for SHA-256 376e9fe6ca7e91dd…

MALICIOUS

PDF

37.1 KB Created: 2021-05-17 19:31:02 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: a579dab8e05d43f58f75ced2378deb4a SHA-1: a7157a7ecd5c905bc5e104e40813b5115c7fae19 SHA-256: 376e9fe6ca7e91dd20050829c54b27a876c404aeed825138100eadb5a6ed5787
170 Risk Score

Malware Insights

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

The PDF file contains multiple heuristics indicating a malicious redirector link and brand-impersonation credential phishing, specifically impersonating Netflix. The embedded URL leads to a "free generator / game hack" lure, which is a common tactic for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest an attempt to trick users into visiting a malicious site, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier clean score 0.0334

Heuristics 5

  • 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.
  • 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/roblox-help-free-robux-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/roblox-help-free-robux-game-hack In PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000035b2.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x35B2 26064 bytes
SHA-256: a4aa47e1d932d73f15539bc63275b1f0d581c92d0ef6fc47061349a5b5ea5625
font_01_sfnt_off00006ffe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6FFE 18264 bytes
SHA-256: 4686decc205f725eac2af31d2bb610515d085fb80a4fbb870416018a21b04127

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