Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8854baa29b41e00…

MALICIOUS

PDF

33.9 KB Created: 2021-07-06 11:41:39 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: a43cad1b79b2b79a69f6efab66a8029f SHA-1: dd9a0f384a3ac547828478686551c5966d07074e SHA-256: f8854baa29b41e00b2f20b372e5b9d33a23342526bdb0b80bb2ec3599acbeb5d
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to external websites, including a known malicious redirector at http://netcdn.tw/app/835599320/tiktok-free-views-game-hack, which is designed to lure users with promises of free game hacks and views. The document also hosts a large number of links to other PDFs, likely part of an SEO link farm, further distributing malicious content. No scripts were extracted, but the primary attack pattern involves social engineering through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/tiktok-free-views-game-hack In PDF document text
    • https://lib.bunghatta.ac.id/app/repository/roblox-hack-tool-jailbreak_GM431946152.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/hack-codes-for-free-robux_GM431946152.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/roblox-hack-and-cheats-robux-generator_GM431946152.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/coin-blogspot_GM406889139.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/free-roblox-gift-card-codes-2021_GM431946152.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/roblox-animation-pack-free_GM431946152.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/can-you-get-robux-with-cheat-engine_GM431946152.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/how-to-get-clothe-goku-free-roblox_GM431946152.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/help-c-o-m-to-earn-free-25k-robux_GM431946152.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/invited-free-robux-glitch-by-unknown_GM431946152.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/free-roblox-dominus-infernus_GM431946152.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/minecraft-noob-vs-pro-vs-hacker_GM479516143.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/hacks-for-coin-master_GM406889139.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/how-to-get-free-robux-on-ipad-mini-2021_GM431946152.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/top-10-free-items-in-roblox_GM431946152.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/hacks-roblox-my-hero-academis_GM431946152.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/roblox-how-to-get-non-free-models_GM431946152.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/how-to-get-everything-for-free-in-roblox_GM431946152.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/how-to-get-robux-cheat-way_GM431946152.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/how-to-download-roblox-for-free_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_off0000328e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x328E 21488 bytes
SHA-256: fdb074f96a8b739ed9d99e49cb0fcd88f0e1d10d483520d563a0a02fdea9cd62
font_01_sfnt_off000061b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61B8 18268 bytes
SHA-256: d820f3f51e2ba3ef6a73a64827aca4f18aa52e36628576c877f3f1fb2ca3df3d

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