Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f7d99a7fcc56389…

MALICIOUS

PDF

31.5 KB Created: 2021-06-01 07:53:34 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 3db38cc167db74e2b48580817c695d04 SHA-1: 442f721a01e981e780dcbb082624697f3e9d36f6 SHA-256: 2f7d99a7fcc56389c845542d5cb7c41e4c85d8150060140849626c234615a5b0
212 Risk Score

Malware Insights

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

The PDF contains multiple links to websites offering game hacks and cheats, identified as a lure for malicious redirection. The ML classifier strongly supports the malicious nature of this PDF. The primary IOC is the redirector URL, which likely serves as a gateway to further malicious content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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.
  • 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.
  • 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.xyz/app/431946152/roblox-hack-and-cheats-for-exploit-free-download-game-hack In PDF document text
    • https://bibliopolis.be/wp-content/uploads/fsqm-files/free-robux-no-human-verification-or-survey-or-download_GM431946152.pdfIn PDF document text
    • https://bibliopolis.be/wp-content/uploads/fsqm-files/roblox-counter-blox-roblox-offensive-hack-2021_GM431946152.pdfIn PDF document text
    • https://bibliopolis.be/wp-content/uploads/fsqm-files/roblox-hacks-for-super-power-training-simulator_GM431946152.pdfIn PDF document text
    • https://bibliopolis.be/wp-content/uploads/fsqm-files/get-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://bibliopolis.be/wp-content/uploads/fsqm-files/www-we-hack-com-roblox_GM431946152.pdfIn PDF document text
    • https://bibliopolis.be/wp-content/uploads/fsqm-files/roblox-sign-up-free-account_GM431946152.pdfIn PDF document text
    • https://bibliopolis.be/wp-content/uploads/fsqm-files/free-printable-minecraft-coloring-pages_GM479516143.pdfIn PDF document text
    • https://bibliopolis.be/wp-content/uploads/fsqm-files/roblox-hack-booga-booga-download-2021_GM431946152.pdfIn PDF document text
    • https://bibliopolis.be/wp-content/uploads/fsqm-files/hack-roblox-a-telecharger-gratuit_GM431946152.pdfIn PDF document text
    • https://bibliopolis.be/wp-content/uploads/fsqm-files/roblox-hack_GM431946152.pdfIn PDF document text
    • https://bibliopolis.be/wp-content/uploads/fsqm-files/how-to-get-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • https://bibliopolis.be/wp-content/uploads/fsqm-files/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://bibliopolis.be/wp-content/uploads/fsqm-files/www-free-robux_GM431946152.pdfIn PDF document text
    • https://bibliopolis.be/wp-content/uploads/fsqm-files/get-free-robux_GM431946152.pdfIn PDF document text
    • https://bibliopolis.be/wp-content/uploads/fsqm-files/free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://bibliopolis.be/wp-content/uploads/fsqm-files/how-to-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://bibliopolis.be/wp-content/uploads/fsqm-files/how-to-use-cheat-engine-on-roblox-2021-august_GM431946152.pdfIn PDF document text
    • https://bibliopolis.be/wp-content/uploads/fsqm-files/como-ser-hacker-en-roblox-2021_GM431946152.pdfIn PDF document text
    • https://bibliopolis.be/wp-content/uploads/fsqm-files/how-do-u-get-free-robux_GM431946152.pdfIn PDF document text
    • https://bibliopolis.be/wp-content/uploads/fsqm-files/minecraft-for-chromebook-free_GM479516143.pdfIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000051d1.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x51D1 16893 bytes
SHA-256: b1d82904a4e2917d9d089bc0458456372f4fc3ec6c30e91f12d6417d20f2ac2f