Malicious PDF — malware analysis report

Static analysis result for SHA-256 8010b43892083b8a…

MALICIOUS

PDF

42.1 KB Created: 2021-05-14 20:00:39 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: fde7e96d21e9e783f3063b5d06870ff6 SHA-1: 6b74b98cb05af805467693dde1247c18521c10b8 SHA-256: 8010b43892083b8ac0a7ad6cd8a3ef45d2a202a372a2e1b0e6d748bb9305ff8b
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to websites offering game hacks and free in-game items, such as 'free robux' and 'coin master hack'. One critical heuristic identified a link to a known malicious redirector infrastructure at https://netcdn.xyz/. The document body also contains this URL and other links to PDF files hosted on allhimalayantreks.com, suggesting a link farm designed to attract users with deceptive content. No scripts were extracted, but the primary attack pattern is social engineering via deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 https://netcdn.xyz/app/406889139/how-to-get-free-pet-food-in-coin-master-game-hack In PDF document text
    • https://allhimalayantreks.com/userfiles/files/get-me-free-robux_GM431946152.pdfIn PDF document text
    • https://allhimalayantreks.com/userfiles/files/free-roblox-glasses_GM431946152.pdfIn PDF document text
    • https://allhimalayantreks.com/userfiles/files/how-to-add-mods-to-minecraft-pe_GM479516143.pdfIn PDF document text
    • https://allhimalayantreks.com/userfiles/files/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • https://allhimalayantreks.com/userfiles/files/coin-master-hack-mod-apk-35-8_GM406889139.pdfIn PDF document text
    • https://allhimalayantreks.com/userfiles/files/websites-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://allhimalayantreks.com/userfiles/files/haktuts-coin-master-free-spin-today_GM406889139.pdfIn PDF document text
    • https://allhimalayantreks.com/userfiles/files/roblox-gift-card-online-free_GM431946152.pdfIn PDF document text
    • https://allhimalayantreks.com/userfiles/files/free-minecraft-account-and-password_GM479516143.pdfIn PDF document text
    • https://allhimalayantreks.com/userfiles/files/free-robux-without-verification_GM431946152.pdfIn PDF document text
    • https://allhimalayantreks.com/userfiles/files/coin-master-heaven-free-spins_GM406889139.pdfIn PDF document text
    • https://allhimalayantreks.com/userfiles/files/roblox-hacks-2021_GM431946152.pdfIn PDF document text
    • https://allhimalayantreks.com/userfiles/files/how-to-get-free-robux-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://allhimalayantreks.com/userfiles/files/jailbreak-roblox-hack_GM431946152.pdfIn PDF document text
    • https://allhimalayantreks.com/userfiles/files/earn-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • https://allhimalayantreks.com/userfiles/files/free-roblox-pin-codes_GM431946152.pdfIn PDF document text
    • https://allhimalayantreks.com/userfiles/files/coin-master-daily-free-spins-link-blogspot_GM406889139.pdfIn PDF document text
    • https://allhimalayantreks.com/userfiles/files/free-minecraft-premium-account_GM479516143.pdfIn PDF document text
    • https://allhimalayantreks.com/userfiles/files/how-to-get-free-robux-generator_GM431946152.pdfIn PDF document text
    • https://allhimalayantreks.com/userfiles/files/coin-game_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_off00004a2b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A2B 24924 bytes
SHA-256: 77d8f80fe1aaf064b1e8e736737f0f7ba634e3e97fa513dfb68080a6dfaee803
font_01_sfnt_off0000824c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x824C 18200 bytes
SHA-256: a92a000b12fc17df4de65e8a645dd765e0ebe973de1e7397a81e6151f516d7b2

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