Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c96856c6101a0ea…

MALICIOUS

PDF

35.5 KB Created: 2021-07-06 10:30:28 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: ed3c8b9e50a8daf8967165e98f11bfe1 SHA-1: 239916dcb8d67d849ae5dc9afd98ea48ac151bf5 SHA-256: 4c96856c6101a0ea2f7aed9223a50bdcca8c73ace0b4ecdc2024d9b96631a9a9
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors and lures users with 'game hack' and 'free generator' themes. The document body, though partially corrupted, contains a primary URL that appears to be part of a scam. The presence of embedded URLs and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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/406889139/free-spins-on-coin-master-without-human-verification-game-hack In PDF document text
    • http://ycstamping.com.tw/image/data/files/hackear-roblox-cheat-engine_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/hack-mod-coin-master_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/hack-my-game-xyz-coin-master_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/inappropriate-roblox-games_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-robux-net_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/como-hackear-roblox-para-tener-robux-en-telefono_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/minecraft-windows-10-edition-hacks_GM479516143.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-robux-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/roblox-adventure-story-wraith-card-hack_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/how-free-builders-club-roblox-2021_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/coin-master-free-spins-1-coin-master_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/coin-master-free-spins-and-chips_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/minecraft-free-online-unblocked_GM479516143.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/roblox-free-robux-hack_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-roblox-accounts-with-robux-2021_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/coin-master-level-4_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-coin-master-coins-2021_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-robux-without-any-verification_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/pokemon-go-free-mew_GM1094591345.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/roblox-free-robux-no-verification_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_off000032cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x32CB 22924 bytes
SHA-256: 0e1bab61f7303357383cce3b135354e795c0bfb35998020488f0623da53c7431
font_01_sfnt_off0000660d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x660D 19072 bytes
SHA-256: 27ae5e168144f9143b4eb17c336d82063430b57a560ff005ec1c031da73db6d2

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