Malicious PDF — malware analysis report

Static analysis result for SHA-256 c760668b39f9807d…

MALICIOUS

PDF

34.4 KB Created: 2021-06-19 10:36:13 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 7eac17921e009b0e64b930b0ed6959dd SHA-1: 09386f025f11da7fa4d164001a63ca0dbd30d509 SHA-256: c760668b39f9807d15f28043741bd00751746c6a98af3d74a058d774b71063bd
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on 'perpus.polimarim.online' and appear to be part of a link farm designed to attract users searching for game cheats or currency generators. One critical heuristic identified a link to known malicious redirector infrastructure at 'http://netcdn.co/app/431946152/free-roblox-ames-game-hack'. The document body, though partially garbled, contains similar lure text and URLs, reinforcing the phishing pretext.

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.co/app/431946152/free-roblox-ames-game-hack In PDF document text
    • http://perpus.polimarim.online/repository/free-robux-roblox-yolasite_GM431946152.pdfIn PDF document text
    • http://perpus.polimarim.online/repository/digital-bandits-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.polimarim.online/repository/i-cant-get-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.polimarim.online/repository/how-to-make-my-own-coin-master-cards-hack_GM406889139.pdfIn PDF document text
    • http://perpus.polimarim.online/repository/minecraft-download-free-download_GM479516143.pdfIn PDF document text
    • http://perpus.polimarim.online/repository/coin-master-hack-no-survey-2021_GM406889139.pdfIn PDF document text
    • http://perpus.polimarim.online/repository/how-i-get-free-robux-nicster-v_GM431946152.pdfIn PDF document text
    • http://perpus.polimarim.online/repository/secret-hack-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.polimarim.online/repository/free-robux-generator-2021-no-verification_GM431946152.pdfIn PDF document text
    • http://perpus.polimarim.online/repository/legit-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.polimarim.online/repository/hack-de-roblox-robux-2021_GM431946152.pdfIn PDF document text
    • http://perpus.polimarim.online/repository/is-roblox-free-on-xbox_GM431946152.pdfIn PDF document text
    • http://perpus.polimarim.online/repository/minecraft-free-minecoins_GM479516143.pdfIn PDF document text
    • http://perpus.polimarim.online/repository/roblox-hack-using-cheat-engine_GM431946152.pdfIn PDF document text
    • http://perpus.polimarim.online/repository/how-to-get-free-robux-clickbait_GM431946152.pdfIn PDF document text
    • http://perpus.polimarim.online/repository/coin-master-spin-free_GM406889139.pdfIn PDF document text
    • http://perpus.polimarim.online/repository/get-100-robux-for-free-promo-code_GM431946152.pdfIn PDF document text
    • http://perpus.polimarim.online/repository/free-robux-add_GM431946152.pdfIn PDF document text
    • http://perpus.polimarim.online/repository/google-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://perpus.polimarim.online/repository/coin-master-free-spins-no-human-verification_GM406889139.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002f86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F86 22572 bytes
SHA-256: 77cd0cf0d4ea27df81d35b083b14949252b6716848b22e0c920595c68eb79b00
font_01_sfnt_off000061ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61EC 18908 bytes
SHA-256: 8b4e17e376ef7c70ac9fa3403f007fe337a16e015d422459fe9ec5ebb5c25bdb

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