Malicious PDF — malware analysis report

Static analysis result for SHA-256 10a57dadc5dd3dca…

MALICIOUS

PDF

33.3 KB Created: 2021-07-03 23:13:21 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: d4d17379e0938a3e81a6ad8d5c677c19 SHA-1: d176bd516cb48a3735e95b60fafe8c39d61b20c3 SHA-256: 10a57dadc5dd3dca4e2a883c3c60f3f08b8d4df0c59fcdd0361b05e1224ea2fa
220 Risk Score

Malware Insights

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

This PDF document is designed to lure users into clicking links by promising game hacks and free currency. It contains a high number of SEO-optimized PDF links, many of which point to a malicious redirector infrastructure. The primary goal appears to be driving traffic to these malicious sites, potentially for further exploitation or phishing. No scripts were extracted, but the PDF structure and embedded links strongly suggest a malicious intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/406889139/coin-master-link-app-game-hack In PDF document text
    • http://library.stieyapan.ac.id/repository/coin-master-32-mod-hack-unlimited_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/chisel-and-bits-mod-pe_GM479516143.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/coin-master-hack-mod-game-download_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/free-robux-no-human-verification-generator_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/get-robux-free-and-legit_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/coin-master-hack-for-ios_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/coin-master-cheat-engine-hack_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/free-coins-on-coin-master-without-verification_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/coin-master-hack-extension_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/robux-com-free-robux_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/free-robux-place-uncopylocked_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/roblox-weightlifter-cheat-codes-working_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/free-minecraft-accounts-2021_GM479516143.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/roblox-studio-free-robux_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/doctor-louie-roblox_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/coin-master-fan-page-facebook_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/best-free-minecraft-server-hosting-reddit_GM479516143.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/how-to-get-free-robux-not-a-scam_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/robux-free-gift-card-org-hack_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/free-robux-patched-2021_GM431946152.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_off00002dd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2DD0 22552 bytes
SHA-256: 4bad54d0b6f9902bb12c55365735ba542ac0f11fecad53e31e7e15558f8f6be1
font_01_sfnt_off00005f99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F99 18180 bytes
SHA-256: 2ae8f2b3b5cdc8131dc5e18a1aa1f950e285eeef7e1996aa3994a171319f8738

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