Malicious PDF — malware analysis report

Static analysis result for SHA-256 1dfc4caa975b45f3…

MALICIOUS

PDF

40.0 KB Created: 2021-05-14 19:29:09 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 91e37de7f784836c27655638de350c0c SHA-1: 41741e466c43f9b22a95b33247ceea18ae3dba3c SHA-256: 1dfc4caa975b45f3382f7423d76eb7093d84ea2ae2fb69e2af08cd43351423c7
212 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains numerous links designed to appear as game-related cheats and generators, such as 'coin-master-coins-game-hack'. The primary link redirects to a known malicious infrastructure, and the document body itself contains obfuscated text along with multiple links to external PDF files, suggesting a link farm for SEO poisoning. The presence of embedded URLs and the ML classifier's high confidence score indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/406889139/coin-master-coins-game-hack In PDF document text
    • http://gomelavto.by/images/coin-master-free-spins-2021-app_GM406889139.pdfIn PDF document text
    • http://gomelavto.by/images/free-spins-and-coins-coin-master-links_GM406889139.pdfIn PDF document text
    • http://gomelavto.by/images/coin-master-spin-link-free-download_GM406889139.pdfIn PDF document text
    • http://gomelavto.by/images/codes-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://gomelavto.by/images/coin-master-free-spin-realme-products_GM406889139.pdfIn PDF document text
    • http://gomelavto.by/images/how-to-get-free-robux-without-verification-2021_GM431946152.pdfIn PDF document text
    • http://gomelavto.by/images/free-robux-group-payouts_GM431946152.pdfIn PDF document text
    • http://gomelavto.by/images/coin-master-daily-gift-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://gomelavto.by/images/get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://gomelavto.by/images/minecraft-apk-114_GM479516143.pdfIn PDF document text
    • http://gomelavto.by/images/free-robux-without-verification_GM431946152.pdfIn PDF document text
    • http://gomelavto.by/images/cool-free-minecraft-skins_GM479516143.pdfIn PDF document text
    • http://gomelavto.by/images/roblox-fun-com-free-robux_GM431946152.pdfIn PDF document text
    • http://gomelavto.by/images/apps-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://gomelavto.by/images/how-to-get-free-robux-for-free_GM431946152.pdfIn PDF document text
    • http://gomelavto.by/images/free-spin-link-in-coin-master_GM406889139.pdfIn PDF document text
    • http://gomelavto.by/images/minecraft-that-you-can-play-for-free_GM479516143.pdfIn PDF document text
    • http://gomelavto.by/images/how-to-get-free-robux-app_GM431946152.pdfIn PDF document text
    • http://gomelavto.by/images/coinmaster-fan-page_GM406889139.pdfIn PDF document text
    • http://gomelavto.by/images/sites-to-get-free-robux_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
stream_003_off00004a62.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A62 25400 bytes
SHA-256: 267bf7d3ea483b75d48ef2da0c1ed140f0e86f38016091955af1c570281a5695
font_01_sfnt_off0000829a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x829A 17544 bytes
SHA-256: 5ee316c89f58fa7ece53e10d1822e70a80b2e7ece9f31707ca69690d36fdc75d

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