Malicious PDF — malware analysis report

Static analysis result for SHA-256 840608f767bbfd40…

MALICIOUS

PDF

33.6 KB Created: 2021-07-07 02:14:35 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 355affbaf843bfc1c20dce1a6f0907a4 SHA-1: 8090489fbd80eb4ff4c0b1f9fc478a874dea77bf SHA-256: 840608f767bbfd4045984246dbb6575a9f2c65cf93e9828fd3ecc9a6dc56ce9a
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/431946152/hey-google-how-do-you-get-free-robux-game-hack PDF link annotation
    • https://miraller.com/upload/files/wurst-hacks_GM479516143.pdfIn PDF document text
    • https://miraller.com/upload/files/best-free-minecraft-hacked-client_GM479516143.pdfIn PDF document text
    • https://miraller.com/upload/files/windows-10-minecraft-hacks_GM479516143.pdfIn PDF document text
    • https://miraller.com/upload/files/how-to-get-minecraft-java-for-free_GM479516143.pdfIn PDF document text
    • https://miraller.com/upload/files/coin-master-golden-cards-hack_GM406889139.pdfIn PDF document text
    • https://miraller.com/upload/files/how-to-get-free-robux-app_GM431946152.pdfIn PDF document text
    • https://miraller.com/upload/files/free-robux-no-survey-xbox-one_GM431946152.pdfIn PDF document text
    • https://miraller.com/upload/files/how-to-hack-roblox-to-get-robux_GM431946152.pdfIn PDF document text
    • https://miraller.com/upload/files/archery-master-3d-hack-unlimited-coins-cheats_GM406889139.pdfIn PDF document text
    • https://miraller.com/upload/files/roblox-apocalypse-rising-hack_GM431946152.pdfIn PDF document text
    • https://miraller.com/upload/files/unpatchable-robux-hack-robuxian-code_GM431946152.pdfIn PDF document text
    • https://miraller.com/upload/files/free-robux-with-no-verification_GM431946152.pdfIn PDF document text
    • https://miraller.com/upload/files/roblox-free-clothes-codes-2021_GM431946152.pdfIn PDF document text
    • https://miraller.com/upload/files/codes-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://miraller.com/upload/files/free-roblox-accounts-and-passwords-2021_GM431946152.pdfIn PDF document text
    • https://miraller.com/upload/files/roblox-hacked-version_GM431946152.pdfIn PDF document text
    • https://miraller.com/upload/files/coin-master-rewards-free-spins_GM406889139.pdfIn PDF document text
    • https://miraller.com/upload/files/how-to-hack-to-get-robux-on-roblox_GM431946152.pdfIn PDF document text
    • https://miraller.com/upload/files/roblox-fake-cheat_GM431946152.pdfIn PDF document text
    • https://miraller.com/upload/files/how-to-minecraft-for-free_GM479516143.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_off00002c90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2C90 21904 bytes
SHA-256: d430acadb48dbc8645f6a3ad5f14b6f05d7711e0772b34065c10cee1779d91f2
font_01_sfnt_off00005c88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5C88 19568 bytes
SHA-256: c947cb9e4153dfb2ea198cd701ec4d5f338e29feb7802fd2debd87897cec7901

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