Malicious PDF — malware analysis report

Static analysis result for SHA-256 889c8cbf6081fabe…

MALICIOUS

PDF

45.7 KB Created: 2021-06-11 07:02:47 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 1cf3f185902f7449791f6d5ff4378367 SHA-1: 0dd500218bedd764a7e07af81ff880303766266d SHA-256: 889c8cbf6081fabefa3fc550f53846b423e31608972b4f2d0e82e68ef80c29b3
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, including a known malicious redirector, disguised as game hacks and generators. The document body and embedded links suggest a lure for users seeking free in-game currency or cheats, which is a common tactic for phishing or malware distribution. The presence of multiple SEO-optimized PDF links further indicates an attempt to drive traffic to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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.tw/app/431946152/roblox-free-online-play-as-guest-game-hack In PDF document text
    • http://www.furuihp.com/Public/upload/editorfiles/how-to-get-free-robux-without-doing-anything-2021_GM431946152.pdfIn PDF document text
    • http://www.furuihp.com/Public/upload/editorfiles/play-full-version-of-minecraft-for-free-no-download_GM479516143.pdfIn PDF document text
    • http://www.furuihp.com/Public/upload/editorfiles/how-do-you-get-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://www.furuihp.com/Public/upload/editorfiles/roblox-free-costumes_GM431946152.pdfIn PDF document text
    • http://www.furuihp.com/Public/upload/editorfiles/free-coin-spin-coin-master_GM406889139.pdfIn PDF document text
    • http://www.furuihp.com/Public/upload/editorfiles/pastebin-hack-robux-1-oct_GM431946152.pdfIn PDF document text
    • http://www.furuihp.com/Public/upload/editorfiles/coin-master-hack-xyz-2021_GM406889139.pdfIn PDF document text
    • http://www.furuihp.com/Public/upload/editorfiles/coin-master-attack-madness-hack_GM406889139.pdfIn PDF document text
    • http://www.furuihp.com/Public/upload/editorfiles/roblox-executor-free_GM431946152.pdfIn PDF document text
    • http://www.furuihp.com/Public/upload/editorfiles/coin-master-free-coins-hack_GM406889139.pdfIn PDF document text
    • http://www.furuihp.com/Public/upload/editorfiles/roblox-hack-and-cheats-for-exploit-free-download_GM431946152.pdfIn PDF document text
    • http://www.furuihp.com/Public/upload/editorfiles/totally-free-coin-master-spins-2021_GM406889139.pdfIn PDF document text
    • http://www.furuihp.com/Public/upload/editorfiles/code-free-robux_GM431946152.pdfIn PDF document text
    • http://www.furuihp.com/Public/upload/editorfiles/coin-master-hack-apk-2021-download_GM406889139.pdfIn PDF document text
    • http://www.furuihp.com/Public/upload/editorfiles/how-to-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://www.furuihp.com/Public/upload/editorfiles/minecraft-free-computer-game_GM479516143.pdfIn PDF document text
    • http://www.furuihp.com/Public/upload/editorfiles/coin-master-cheats-without-verification_GM406889139.pdfIn PDF document text
    • http://www.furuihp.com/Public/upload/editorfiles/minecraft-auto-miner-hack_GM479516143.pdfIn PDF document text
    • http://www.furuihp.com/Public/upload/editorfiles/coin-master-guide-to-free-spins-and-rewards_GM406889139.pdfIn PDF document text
    • http://www.furuihp.com/Public/upload/editorfiles/how-to-get-free-spins-on-coin-master-2021-iphone_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
stream_004_off00005218.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5218 26764 bytes
SHA-256: 98c3710fcc605cbd0531d0bf75fd20a93484d8233c5c6accb637213dce7f4edb
font_01_sfnt_off00008e5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E5B 18872 bytes
SHA-256: ab1f94c576247b5ffdfd24cf953f561397af8a762d0d7e6166bc773f2545ba50

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