Malicious PDF — malware analysis report

Static analysis result for SHA-256 7850d3afd6f33ef8…

MALICIOUS

PDF

33.3 KB Created: 2021-06-20 15:50:25 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: cc0b138fbc0361e2f92f2168eadd4e0c SHA-1: 670282ca670cadd18dfe13f0468196ef11378d8a SHA-256: 7850d3afd6f33ef85c9882527b4028a745673509fa3c59226cf3b471a0cc201a
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links disguised as game hacks and generators, directing users to malicious redirector infrastructure. The primary lure appears to be related to Roblox and Coin Master, aiming to trick users into downloading further malicious content or visiting compromised sites. No scripts were extracted, but the embedded URLs and the nature of the lures strongly suggest a phishing or social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9824

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/hack-roblox-counter-blox-2021-game-hack In PDF document text
    • https://weddingcards-expert.tw/upload/files/minecraft-free-install_GM479516143.pdfIn PDF document text
    • https://weddingcards-expert.tw/upload/files/free-roblox-accounts-dantdm_GM431946152.pdfIn PDF document text
    • https://weddingcards-expert.tw/upload/files/coin-master-20-free-spins-link-today_GM406889139.pdfIn PDF document text
    • https://weddingcards-expert.tw/upload/files/how-do-you-use-tunturned-roblox-hack_GM431946152.pdfIn PDF document text
    • https://weddingcards-expert.tw/upload/files/daily-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • https://weddingcards-expert.tw/upload/files/is-roblox-free-on-three_GM431946152.pdfIn PDF document text
    • https://weddingcards-expert.tw/upload/files/coin-master-ios-hack-download_GM406889139.pdfIn PDF document text
    • https://weddingcards-expert.tw/upload/files/free-robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://weddingcards-expert.tw/upload/files/free-robux-games-that-actually-work-2021_GM431946152.pdfIn PDF document text
    • https://weddingcards-expert.tw/upload/files/pokemon-go-free-candy-cheat_GM1094591345.pdfIn PDF document text
    • https://weddingcards-expert.tw/upload/files/minecraft-fly-hack_GM479516143.pdfIn PDF document text
    • https://weddingcards-expert.tw/upload/files/free-dominus-roblox_GM431946152.pdfIn PDF document text
    • https://weddingcards-expert.tw/upload/files/increible-hack-de-robux_GM431946152.pdfIn PDF document text
    • https://weddingcards-expert.tw/upload/files/how-to-get-free-plus-on-roblox-meepcity-2021_GM431946152.pdfIn PDF document text
    • https://weddingcards-expert.tw/upload/files/how-to-download-minecraft-for-free-on-windows_GM479516143.pdfIn PDF document text
    • https://weddingcards-expert.tw/upload/files/free-robux-no-human-verify_GM431946152.pdfIn PDF document text
    • https://weddingcards-expert.tw/upload/files/how-to-free-robux_GM431946152.pdfIn PDF document text
    • https://weddingcards-expert.tw/upload/files/roblox-flood-escape-hack-script_GM431946152.pdfIn PDF document text
    • https://weddingcards-expert.tw/upload/files/roblox-robux-generator_GM431946152.pdfIn PDF document text
    • https://weddingcards-expert.tw/upload/files/hack-de-coin-master_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_off00002a87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2A87 22336 bytes
SHA-256: 0d0cc6ed7f7255b740a72a62430f12639bed2d3f9e56a7c61a96f9e373e44a68
font_01_sfnt_off00005c2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5C2C 19300 bytes
SHA-256: fc074bf3d5c7508ab6364356b9059cf67ac0375799962b5a227ae7c00a68b2f2

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