Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a9088c0c1446979…

MALICIOUS

PDF

31.2 KB Created: 2021-07-20 14:00:30 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 09ac26b4218cb2fcc366a87258dee56d SHA-1: 5114b2ea2757545ab6da742aac5cf94654b95ed4 SHA-256: 1a9088c0c14469796da6b04bc1f424a4c2df198144d105cd45ed635d3fe84b79
160 Risk Score

Malware Insights

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

The PDF contains multiple links to a redirector hosted on 'netcdn.tw' which is flagged as malicious. The document body and embedded links suggest a lure for a 'Robux generator' or 'game hack', a common social engineering tactic. The ML classifier also flagged the PDF as malicious, indicating a high likelihood of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9426

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/431946152/you-promised-my-son-free-robux-game-hack In PDF document text
    • https://www.awwda.go.ke/wp-content/uploads/fsqm-files/how-to-get-free-robux-on-ipad_GM431946152.pdfIn PDF document text
    • https://www.awwda.go.ke/wp-content/uploads/fsqm-files/how-to-get-free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • https://www.awwda.go.ke/wp-content/uploads/fsqm-files/robux-hack-2021_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
font_00_sfnt_off0000233e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x233E 22360 bytes
SHA-256: 890b91881195f95a0aecfb688f3ae15fb5955b3f885ed6524691210e2cbd2947
font_01_sfnt_off000054dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x54DC 19444 bytes
SHA-256: 6593f4e1ca527274dc91d112dc435aa157e33331642105ece820a83e227687ad

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