Malicious PDF — malware analysis report

Static analysis result for SHA-256 778ae9acbf8dfdbb…

MALICIOUS

PDF

43.4 KB Created: 2021-05-13 14:36:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05
MD5: b604d3e110af2e8bd3117877cbe9e902 SHA-1: bedbdb9226d92c17a501ef0b8b70805b6ea91c5d SHA-256: 778ae9acbf8dfdbbfa2b4138c17345082d9ecae8136fa28a1401506a7116f43c
72 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a lure for a game hack generator, specifically for Coin Master, directing users to a suspicious URL. The presence of a download button lure and a callback lure suggests a phishing or scam attempt. Although no scripts were explicitly extracted, the PDF structure and embedded URI heuristics indicate an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier clean score 0.0119

Heuristics 5

  • PDF links to a 'free generator / game hack' redirector high 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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/406889139/coin-master-guide-to-free-spins-and-rewards-game-hack PDF link annotation
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00003643.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3643 25408 bytes
SHA-256: 9b1496ab13cc8e8421a84407a33458683fd174c46c7630931b32665eb4f6c333
font_01_sfnt_off00007006.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7006 4092 bytes
SHA-256: c42ddc52594bb1b1147f846c126bf170ce8763f7029b88f31e537a748176ead9
font_02_sfnt_off00007de1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7DE1 2788 bytes
SHA-256: 6fd7c7f447d66842f81aa8cf197935b17f22157d0c7e9f95622df1b5b4ddf530
font_03_sfnt_off000087d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x87D1 18364 bytes
SHA-256: 2e73bbcc61a316d483caaaa2f5809914442c3887edea3c85db373adc87971b60

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