Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a277becf62594cb…

MALICIOUS

PDF

32.0 KB Created: 2021-07-03 12:31:16 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 4b0d853af04ee13b1c06f58d5169daba SHA-1: a0ec2efafcf3264156bbff87f7fcf289dbeaca5d SHA-256: 4a277becf62594cbebc732b1418fff29347624b3b2976f45387d2f4988d10aad
212 Risk Score

Malware Insights

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

The PDF contains numerous links, including a critical redirector to 'free-spin-link-game-hack', which is identified as malicious. The document body and embedded links suggest a lure for game-related cheats or generators, a common tactic for distributing malware. The ML classifier strongly supports the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://netcdn.tw/app/406889139/free-spin-link-game-hack In PDF document text
    • https://digilib.darmajaya.ac.id/repository/roblox-script-hacks_GM431946152.pdfIn PDF document text
    • https://digilib.darmajaya.ac.id/repository/free-robux-hack-no-human-verification_GM431946152.pdfIn PDF document text
    • https://digilib.darmajaya.ac.id/repository/can-you-give-me-free-robux_GM431946152.pdfIn PDF document text
    • https://digilib.darmajaya.ac.id/repository/claim-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://digilib.darmajaya.ac.id/repository/awards-free-robux_GM431946152.pdfIn PDF document text
    • https://digilib.darmajaya.ac.id/repository/free-robux-with-no-verification-2021_GM431946152.pdfIn PDF document text
    • https://digilib.darmajaya.ac.id/repository/coin-master-free-coins-and-spins-link-today_GM406889139.pdfIn PDF document text
    • https://digilib.darmajaya.ac.id/repository/minecraft-tools_GM479516143.pdfIn PDF document text
    • https://digilib.darmajaya.ac.id/repository/free-coin-master-cards_GM406889139.pdfIn PDF document text
    • https://digilib.darmajaya.ac.id/repository/roblox-apocalypse-rising-spawn-hack-2021_GM431946152.pdfIn PDF document text
    • https://digilib.darmajaya.ac.id/repository/coin-master-free-spin-link-today-2021_GM406889139.pdfIn PDF document text
    • https://digilib.darmajaya.ac.id/repository/minecraft-bedrock-server-hosting-free_GM479516143.pdfIn PDF document text
    • https://digilib.darmajaya.ac.id/repository/free-robux-master_GM431946152.pdfIn PDF document text
    • https://digilib.darmajaya.ac.id/repository/how-to-get-minecraft-java-for-free_GM479516143.pdfIn PDF document text
    • https://digilib.darmajaya.ac.id/repository/roblox-mad-city-bypass-anti-cheat-script_GM431946152.pdfIn PDF document text
    • https://digilib.darmajaya.ac.id/repository/how-do-you-get-free-roblox-money_GM431946152.pdfIn PDF document text
    • https://digilib.darmajaya.ac.id/repository/robuxy-com-free-robux_GM431946152.pdfIn PDF document text
    • https://digilib.darmajaya.ac.id/repository/coin-master-hacks-no-surveys_GM406889139.pdfIn PDF document text
    • https://digilib.darmajaya.ac.id/repository/free-free-robux_GM431946152.pdfIn PDF document text
    • https://digilib.darmajaya.ac.id/repository/free-robux-without-human-verification-real_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000033d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x33D8 22724 bytes
SHA-256: fbf6cd3fe2d27a5d6af3028232e8520f9d5b997c1508dd292ac1f29c4b1ba1d4

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