Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd91cc0f1ff34c17…

MALICIOUS

PDF

34.3 KB Created: 2021-06-21 13:06:37 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 8c1b3fbe62d7cd32a2748386b3d16ef1 SHA-1: 6df38cbfbf1e59b23482a1d2b623200b2a49ec76 SHA-256: cd91cc0f1ff34c177fb915ca2a164deaa0a0b7566ffbf6e626a59f7d0d18d79f
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external sites, including a primary redirector at http://netcdn.co/app/431946152/how-to-hack-in-roblox-2021-game-hack, disguised as game hacks and generators. These links likely lead to further malicious content or phishing pages. The document body and heuristics indicate a lure for free game items and hacks, a common social engineering tactic.

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/how-to-hack-in-roblox-2021-game-hack In PDF document text
    • https://www.armera.co.uk/uploads/files/files/how-to-fly-hack-in-roblox-phantom-forces-2021_GM431946152.pdfIn PDF document text
    • https://www.armera.co.uk/uploads/files/files/roblox-pet-simulator-how-to-get-a-free-rainbow-dominus_GM431946152.pdfIn PDF document text
    • https://www.armera.co.uk/uploads/files/files/coin-master-fun-free-spins_GM406889139.pdfIn PDF document text
    • https://www.armera.co.uk/uploads/files/files/robuxy-com-free-robux_GM431946152.pdfIn PDF document text
    • https://www.armera.co.uk/uploads/files/files/pubg-600-uc-in-pakistani-rupees_GM1330123889.pdfIn PDF document text
    • https://www.armera.co.uk/uploads/files/files/minecraft-redeem-code-free_GM479516143.pdfIn PDF document text
    • https://www.armera.co.uk/uploads/files/files/websites-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • https://www.armera.co.uk/uploads/files/files/how-to-hack-coin-master-spin-in-hindi_GM406889139.pdfIn PDF document text
    • https://www.armera.co.uk/uploads/files/files/coin-master-hack-without-human-verification-2021_GM406889139.pdfIn PDF document text
    • https://www.armera.co.uk/uploads/files/files/coin-master-cheats_GM406889139.pdfIn PDF document text
    • https://www.armera.co.uk/uploads/files/files/how-to-get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://www.armera.co.uk/uploads/files/files/hack-to-get-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • https://www.armera.co.uk/uploads/files/files/coin-master-heaven-links-free-spins_GM406889139.pdfIn PDF document text
    • https://www.armera.co.uk/uploads/files/files/free-minecraft-survival-server_GM479516143.pdfIn PDF document text
    • https://www.armera.co.uk/uploads/files/files/hack-spin-coin-master_GM406889139.pdfIn PDF document text
    • https://www.armera.co.uk/uploads/files/files/how-to-get-free-robux-hack-2021_GM431946152.pdfIn PDF document text
    • https://www.armera.co.uk/uploads/files/files/real-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://www.armera.co.uk/uploads/files/files/free-robux-kid-friendly_GM431946152.pdfIn PDF document text
    • https://www.armera.co.uk/uploads/files/files/robux-generator-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • https://www.armera.co.uk/uploads/files/files/coin-master-free-spins-link-today-twitter_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
font_00_sfnt_off00002f84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F84 22136 bytes
SHA-256: c4d3080b4367cbbc4f6bce2ef551801ea61e1acd7ec7a69d2b2ea61ef3fa1dac
font_01_sfnt_off0000605c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x605C 19224 bytes
SHA-256: 19fbb3d2a48e2929f502713a046198cfd603542f55de5b50443dfa872ae97908

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