Malicious PDF — malware analysis report

Static analysis result for SHA-256 51fc5ec300b1f8f7…

MALICIOUS

PDF

50.5 KB Created: 2021-05-10 16:02:09 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 4125a9b676cb48a8ce46cfe3774c9e32 SHA-1: abf42059272b956e3e4e79282179cd44dfdf08da SHA-256: 51fc5ec300b1f8f7609e3211e9c02972fc80b6e51d70d36019aca44188abda23
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links, including one pointing to a known malicious redirector infrastructure, and others that appear to be part of a link farm designed for SEO manipulation. The document body, though partially corrupted, suggests a lure related to 'Coin Master Free Spins Hack', aligning with the heuristic findings of a game hack redirect lure. The presence of numerous links and the nature of the lures indicate a phishing or scam attempt, likely to lead users to malicious websites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8594

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/coin-master-free-spins-hack-game-hack In PDF document text
    • http://lib.untad.ac.id/repository/how-to-change-roblox-username-for-free-2021_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/free-coins-and-spins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id//repository/free-coins-coin-master-link_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id//repository/free-robux-gift-card-codes_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id//repository/mosttechs-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id//repository/free-robux-hack-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id//repository/free-robux-wheel_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/coin-master-how-to-get-free-pet-food_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id//repository/how-to-use-scripts-in-roblox-hack_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/free-robux-only-1-step_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/free-roblox-printables_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id//repository/how-to-get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id//repository/coin-master-free-spins-cheat_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/where-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id//repository/blogspot-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/hacks-para-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id//repository/get-free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id//repository/how-to-block-someone-on-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/coin-master-free-spin-and-coin-links_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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004ab8.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4AB8 25196 bytes
SHA-256: a87b51619b960c586219ab0255e1ca8b829388f60cae65d21b76aee87e9cfbd8
font_01_sfnt_off000083b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x83B1 4068 bytes
SHA-256: e2f269f5a6b97571fa8435c07754994c39a178273e50c0e5f0b3f4273f267849
font_02_sfnt_off0000915b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x915B 7332 bytes
SHA-256: d811e0aca85f3b94c42cd1240eec68b8eb378f3d8be5e408d3f6abd0f11f834d
font_03_sfnt_off0000a373.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA373 18056 bytes
SHA-256: 5bc30252b20e252a4e4f12754ee6fd7a8bdc905346c0352a18cf9aa56584dd16

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