Malicious PDF — malware analysis report

Static analysis result for SHA-256 27789b868797251e…

MALICIOUS

PDF

38.3 KB Created: 2021-05-10 12:35:15 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 5c20a0f6e88ca38d22f5074aef1e0d18 SHA-1: 5c3665a7cedc2c5860c6060081520a336f313eef SHA-256: 27789b868797251e0bcc498ac84c1ae11e03db0e1f284231dd58a599855686d5
180 Risk Score

Malware Insights

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

The PDF contains multiple links to a known malicious redirector infrastructure, masquerading as a free generator for game accounts. The document body and heuristics indicate a lure to trick users into clicking these links, likely leading to further malicious content or exploits. The presence of embedded URLs and the ML classifier strongly support a malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9631

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.
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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/free-roblox-accounts-2021-with-robux-game-hack In PDF document text
    • http://192.168.0.99/%20%3Cp%3E%3Cp%3Efree%20brown%20hair%20roblox%3Cp%3E%3Cp%3ECF%20PRINTING%20AND%20PROMOTION.%20CODES%20PDF link annotation
    • http://192.168.0.99/%20%3Cp%3E%3Cp%3Efree%20brown%20hair%20roblox%3Cp%3E%3Cp%3ECF%20PRINTING%20AND%20PROMOTION.%20CODES%20(7%20days%20agoPDF link annotation
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000368d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x368D 25588 bytes
SHA-256: fec909daee4358d6ad7b1350be6673c681cbe59bdeae6a9c378ba8e72ea1e285
font_01_sfnt_off000071f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x71F6 19076 bytes
SHA-256: a3899638bf51e335cbc40673d1471e0832e9a39f88469ef4ed0809ba61e6f618

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