Malicious PDF — malware analysis report

Static analysis result for SHA-256 112166338d168fd5…

MALICIOUS

PDF

46.2 KB Created: 2021-06-07 19:26:50 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 9b3f1746f6b5fe971e5a51e930943fad SHA-1: dc2e045894e84a5b22348993a0a73fbf3630fffb SHA-256: 112166338d168fd5ef9c1dc1c056ecf67ec51fb8d5c1c66f892ca2e74806ba00
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document employs a lure of game hacks and free currency to entice users. It contains numerous external links, identified as a link farm, likely for SEO manipulation or to redirect users to malicious content. The ML classifier strongly indicated maliciousness, and the document's structure suggests it's part of a larger campaign to drive traffic to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

Heuristics 5

  • 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.
  • 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.
  • 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.tw/app/431946152/robux-hack-no-survey-2021-game-hack PDF link annotation
    • http://sv-nahetal.de/images/how-to-get-minecraft-for-free-on-ipad_GM479516143.pdfIn PDF document text
    • http://sv-nahetal.de/images/how-to-get-free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://sv-nahetal.de/images/minecraft-the-complete-handbook-collection_GM479516143.pdfIn PDF document text
    • http://sv-nahetal.de/images/free-robux-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://sv-nahetal.de/images/how-to-free-robux_GM431946152.pdfIn PDF document text
    • http://sv-nahetal.de/images/free-spin-coin-master-instagram_GM406889139.pdfIn PDF document text
    • http://sv-nahetal.de/images/roblox-avatar-maker-free_GM431946152.pdfIn PDF document text
    • http://sv-nahetal.de/images/how-to-get-minecraft-for-free-ios_GM479516143.pdfIn PDF document text
    • http://sv-nahetal.de/images/coin-master-claim-free-spins_GM406889139.pdfIn PDF document text
    • http://sv-nahetal.de/images/how-to-hack-people-on-roblox_GM431946152.pdfIn PDF document text
    • http://sv-nahetal.de/images/how-to-get-more-robux-for-free_GM431946152.pdfIn PDF document text
    • http://sv-nahetal.de/images/roblox-royalty-free-rap_GM431946152.pdfIn PDF document text
    • http://sv-nahetal.de/images/how-do-i-get-free-robux_GM431946152.pdfIn PDF document text
    • http://sv-nahetal.de/images/how-to-get-free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://sv-nahetal.de/images/clean-master-coins-hack_GM406889139.pdfIn PDF document text
    • http://sv-nahetal.de/images/minecraft-for-ps3-free_GM479516143.pdfIn PDF document text
    • http://sv-nahetal.de/images/free-spins-link-in-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://sv-nahetal.de/images/google-how-do-you-get-robux_GM431946152.pdfIn PDF document text
    • http://sv-nahetal.de/images/coin-master-free-spins-link-today-instagram_GM406889139.pdfIn PDF document text
    • http://sv-nahetal.de/images/coin-master-free-spins-link-whatsapp-group_GM406889139.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_004_off00005300.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5300 27200 bytes
SHA-256: 076e4156b3ea3f3f42eeed32f3f87c77bf8770176b52cffae0512dae792f2eb6
font_01_sfnt_off00008ffd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8FFD 18944 bytes
SHA-256: 999d5a647242e630f5baf1a11d8ccc18753adaaac2a4264c1c281570f4ad602f

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