Malicious PDF — malware analysis report

Static analysis result for SHA-256 35da4e7c49974d07…

MALICIOUS

PDF

49.5 KB Created: 2021-06-10 11:26:25 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 29e05b86b66a25207955ba622dd29306 SHA-1: 4ffa87115387251e6d12a99220a69c32c961bd8c SHA-256: 35da4e7c49974d07a405c79b940293e86ffd9d0b9b8520910ecd0614d6f491bc
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a lure related to game hacks and free generators to entice users. It contains numerous links, including a primary malicious redirector at `https://netcdn.tw/app/431946152/cheat-roblox-superpower-training-simulator-2021-game-hack`, and a link farm hosted on `library.fk.upnvj.ac.id`. The presence of these links and the overall theme suggest an attempt to drive traffic to potentially malicious sites or to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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 https://netcdn.tw/app/431946152/cheat-roblox-superpower-training-simulator-2021-game-hack In PDF document text
    • http://library.fk.upnvj.ac.id/repository/how-to-get-free-robux-on-mobile_GM431946152.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/roblox-how-to-hack-kohls-admin-house_GM431946152.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/how-to-get-minecraft-pe-for-free_GM479516143.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/hack-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/free-robux-for-free_GM431946152.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/pop-slots-free-vegas-casino-slots-machine-game-coin-master_GM406889139.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/how-to-get-20210-robux-for-free_GM431946152.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/can-you-get-minecraft-for-free-on-pc_GM479516143.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/coin-master-free-spins-and-coins-link-haktuts_GM406889139.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/free-games-coin-master_GM406889139.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/minecraft-realms-free_GM479516143.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/roblox-images_GM431946152.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/how-to-hack-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/free-spins-on-coin-master-without-human-verification_GM406889139.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/free-roblox-executor_GM431946152.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/how-to-get-free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/how-to-get-robux-using-cheat-engine-67_GM431946152.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/coin-master-spin-link-today-2021_GM406889139.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/inappropriate-roblox_GM431946152.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/how-to-hack-roblox-accounts-2021_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005329.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5329 25708 bytes
SHA-256: 9eed98e2c472181eb6786124eaf1ffc428b29ba4ffb6d5a810d96b53bdec6641
font_01_sfnt_off00008f02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F02 3400 bytes
SHA-256: 4b3e0f36ad1e0c7e3ea5c178fd2b4f097d1e01575fc6a4101a8b520db34dfe07
font_02_sfnt_off00009a2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9A2B 19832 bytes
SHA-256: 7f877b32fb090229f3131547396486fd128072206057b94b764a38a9d5fc293c

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