Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1d5853bad9a0b7c…

MALICIOUS

PDF

34.4 KB Created: 2021-07-09 14:44:28 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25
MD5: ceacc5d5b0b5fce1d99ab7560978fdec SHA-1: 8da179bb7c2d0dcfa436307a6210c8458d9e8346 SHA-256: b1d5853bad9a0b7c480d2bcc14b7a88bdc828fa5bd2e632297f37be0bdc31d20
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to a known malicious infrastructure, specifically advertising free game hacks and generators. The document body and embedded URLs strongly suggest a lure to trick users into visiting potentially harmful websites. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate a malicious redirector workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/406889139/coin-master-game-download-free-game-hack In PDF document text
    • https://nature-air.com.tw/upload/files/how-to-get-free-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/roblox-tix-hack-generator_GM431946152.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/roblox-free-pants_GM431946152.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/is-minecraft-bedrock-edition-free_GM479516143.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/download-roblox-studio-20-free_GM431946152.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/are-minecraft-realms-free_GM479516143.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/roblox-craftwars-cheats_GM431946152.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/free-items-in-roblox-pastebin_GM431946152.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/hackear-coin-master_GM406889139.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/best-roblox-hacking-executors_GM431946152.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/facebook-coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/hacks-to-get-free-robux-trackid-sp006_GM431946152.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/how-to-get-free-robux-as-a-kid_GM431946152.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/roblox-island-royale-download-free_GM431946152.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/roblox-cheat-lua-codes_GM431946152.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/google-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/minecraft-pocket-edition-apk-free-download_GM479516143.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/robux-hack-download-no-verification_GM431946152.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/hack-roblox-pastebin_GM431946152.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/como-hackear-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
stream_002_off000030ea.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x30EA 22112 bytes
SHA-256: 845446fc7ffcdea9d53f37f0f829a28eb4f94bf40b1f66620d7e3953c4f51aca
font_01_sfnt_off0000621e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x621E 18840 bytes
SHA-256: 07a2ecd712758a67bf43efbf7fc99be42c1d0c21daaacd6bb8efd08b03be94c0

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