Malicious PDF — malware analysis report

Static analysis result for SHA-256 25a55a13a42cca4e…

MALICIOUS

PDF

42.9 KB Created: 2021-05-14 09:05:53 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 85ab4b90415b60f63bf1990fa640cd36 SHA-1: 6d2fc91043a6668d9fc73c17fd9e994198e763f7 SHA-256: 25a55a13a42cca4ebd9d40954e413bc978622c3f6745742dc1615310355220d5
260 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document employs a fake CAPTCHA lure to trick users into clicking links, which is a common social engineering tactic. It contains numerous links to external PDF files, likely for SEO manipulation or to host further malicious content. The primary redirector URL is identified as malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 6

  • 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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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 https://netcdn.xyz/app/431946152/free-robux-just-enter-username-game-hack In PDF document text
    • http://mtsn4.ykt.my.id/__statics/gudangsoal/files/robux-best_GM431946152.pdfIn PDF document text
    • http://mtsn4.ykt.my.id/__statics/gudangsoal/files/free-spins-coin-master-links-thursday-november-28-2021_GM406889139.pdfIn PDF document text
    • http://mtsn4.ykt.my.id/__statics/gudangsoal/files/vip-roblox-free_GM431946152.pdfIn PDF document text
    • http://mtsn4.ykt.my.id/__statics/gudangsoal/files/coin-master-daily-free-spins-link-facebook_GM406889139.pdfIn PDF document text
    • http://mtsn4.ykt.my.id/__statics/gudangsoal/files/minecraft-reach-hack_GM479516143.pdfIn PDF document text
    • http://mtsn4.ykt.my.id/__statics/gudangsoal/files/coin-master-links-free-spins_GM406889139.pdfIn PDF document text
    • http://mtsn4.ykt.my.id/__statics/gudangsoal/files/coin-master-free-spin-generator-without-human-verification_GM406889139.pdfIn PDF document text
    • http://mtsn4.ykt.my.id/__statics/gudangsoal/files/moonactive-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://mtsn4.ykt.my.id/__statics/gudangsoal/files/legit-coin-master-hack-without-verification_GM406889139.pdfIn PDF document text
    • http://mtsn4.ykt.my.id/__statics/gudangsoal/files/how-to-get-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • http://mtsn4.ykt.my.id/__statics/gudangsoal/files/coin-master-hack-2021-apk-download_GM406889139.pdfIn PDF document text
    • http://mtsn4.ykt.my.id/__statics/gudangsoal/files/coin-master-attack-madness-hack_GM406889139.pdfIn PDF document text
    • http://mtsn4.ykt.my.id/__statics/gudangsoal/files/free-robux-sites-that-work_GM431946152.pdfIn PDF document text
    • http://mtsn4.ykt.my.id/__statics/gudangsoal/files/roblox-hack-apk_GM431946152.pdfIn PDF document text
    • http://mtsn4.ykt.my.id/__statics/gudangsoal/files/coin-master-game-legitimate-hack-without-signing-up-or-shareing_GM406889139.pdfIn PDF document text
    • http://mtsn4.ykt.my.id/__statics/gudangsoal/files/free-robux-hack-generator_GM431946152.pdfIn PDF document text
    • http://mtsn4.ykt.my.id/__statics/gudangsoal/files/coin-master-free-spins-and-coins-daily-links_GM406889139.pdfIn PDF document text
    • http://mtsn4.ykt.my.id/__statics/gudangsoal/files/roblox-zone-free-robux_GM431946152.pdfIn PDF document text
    • http://mtsn4.ykt.my.id/__statics/gudangsoal/files/free-spins-coin-master-blogspot_GM406889139.pdfIn PDF document text
    • http://mtsn4.ykt.my.id/__statics/gudangsoal/files/coin-master-card-hack-app_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_003_off00004b89.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B89 24388 bytes
SHA-256: b15850f2b066ea72e718ad3f1aafd2271d45653027b88369ed2860e9a642b08f
font_01_sfnt_off00008339.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8339 18960 bytes
SHA-256: ad194f5984d8cbd7c817d1b512f86f024f40bf30beebdf7d12c6ff62fc849400

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