Malicious PDF — malware analysis report

Static analysis result for SHA-256 c44ce992a7f98ef7…

MALICIOUS

PDF

43.5 KB Created: 2021-06-03 21:06:53 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: a77acfee76e612ff23986d13329b33bf SHA-1: 283090c196b9109378508cc0cb9cdc8542f91ad7 SHA-256: c44ce992a7f98ef7662ae1108a4c5becbe210a9388564adbf92220fd6fa0e187
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links that redirect to known malicious infrastructure, specifically promoting "free generators" for games. The document body, though heavily obfuscated, contains URLs that reinforce this lure. The primary attack pattern involves tricking the user into visiting a malicious site via a deceptive link, likely leading to further malware or scams.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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.
  • 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.online/app/406889139/coin-free-master-game-hack In PDF document text
    • https://kojak-group.com/userfiles/files/free-daily-spin-coin-master-game_GM406889139.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/hack-coin-master-free_GM406889139.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/what-is-robux_GM431946152.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/free-spin-hack-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/free-coin-master-spins-and-coins_GM406889139.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/free-robux-no-verify_GM431946152.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/how-to-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/minecraft-java-edition-free_GM479516143.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/earn-points-for-robux_GM431946152.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/roblox-hack-com_GM431946152.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/coin-master-500-free-spins_GM406889139.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/free-roblox-toy-codes_GM431946152.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/bad-minecraft-free_GM479516143.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/robux-hack-tools_GM431946152.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/how-to-get-free-robux-com_GM431946152.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/how-to-get-free-gold-cards-on-coin-master_GM406889139.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/free-robux-just-enter-username-and-password_GM431946152.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/free-robux-websites-that-work_GM431946152.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/free-minecraft-realm-codes_GM479516143.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/how-to-get-1-million-robux-for-free-2021_GM431946152.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_off00005229.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5229 24476 bytes
SHA-256: 0e337fa41f78d4a3d716d10fc1051205e76c6c4cf57a2a7d90ce15df6e741eb5
font_01_sfnt_off0000891c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x891C 17712 bytes
SHA-256: d81df6b65cf0bb045415549e23d0eb9d7e4a9ed7c869613af9af95d8dd41029c

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