Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b8618320fc91a1c…

MALICIOUS

PDF

34.6 KB Created: 2021-07-05 21:09:19 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: ef13bdb6b068813638275ec0f86f9b2c SHA-1: b82701b7c2476c2250b6b06c32678f1f0ff6d8c8 SHA-256: 2b8618320fc91a1cb5869d3d2382a39919f6376ff73f26ec2060bafff30e1164
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded links, including one identified as a malicious redirector, designed to lure users with promises of free in-game currency. The document body and heuristics indicate a scam related to game hacks and generators. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest a phishing or redirection attempt.

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-bling-bling-card-coin-master-game-hack In PDF document text
    • http://pustaka.ust.ac.id/repository/free-h-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/best-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/free-roblox-codes-to-get-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/get-free-gold-cards-in-coin-master_GM406889139.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/free-robux-no-verification_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/coin-master-free-spins-and-coins-blogspot_GM406889139.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/how-to-get-free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/free-roblox-money-2021_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/cheat-roblox-dragon-ball-rage_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/gift-card-generator-hack-robux-codes_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/coin-master-free-daily-rewards_GM406889139.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/simple-hack-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/roblox-robux-generator-http-freerobuxgenerator-xyz_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/how-to-get-free-robux-for-pc-2021_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/free-roblox-faces-2021_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/minecraft-survival-free_GM479516143.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/how-to-get-free-clothes-on-roblox-2021-on-phone_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/cartoony-animation-free-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/free-roblox-capes-2021_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/free-robux-fun_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
stream_002_off00002ff1.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2FF1 23132 bytes
SHA-256: d971f8e90c36d2ea1e35f5fdf56183c579b7332d488a6ef4b2965705b95d195e
font_01_sfnt_off000063ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63EC 18464 bytes
SHA-256: 9e525174b91ad41fb891ac7cfc07bd8e8020f7e5e3866fd8c2d53bfbd1eafce6

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