Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b1d754dd1bff878…

MALICIOUS

PDF

30.8 KB Created: 2021-07-20 13:37:12 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 5ae400e12cdd5ca7dbfa4169990c3be4 SHA-1: 92daf29d8c7ebb84fd58b5c138f896e6029a8b9e SHA-256: 0b1d754dd1bff8780c104fac5e2ece3dab99d1d8e52717590a1a45deba1da644
130 Risk Score

Malware Insights

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

The PDF file contains a prominent link and a call-to-action button, both directing users to a URL associated with malicious redirector infrastructure. The lure content suggests a scam related to social media engagement, likely intended to trick users into downloading malware or visiting further malicious sites. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier clean score 0.0486

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 http://netcdn.tw/app/835599320/free-views-tiktok-game-hack In 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_off000024e7.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x24E7 22992 bytes
SHA-256: 6a63686798a4fd036b995501b73701740c84b0d7cc7cc1ab1edbb9de1700d226
font_01_sfnt_off00005888.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5888 17752 bytes
SHA-256: ce4f969b492885a6292b68f2810015e61170a5a05df2656d5db0dd0870788c0b

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