Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab4997536a25bdd9…

MALICIOUS

PDF

46.5 KB Created: 2021-06-07 10:56:02 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: cfd7b94f9128e3e32f75e39fd1177b46 SHA-1: 3b8885d9c7cc9c79b49f889abe890ab4d4d550b9 SHA-256: ab4997536a25bdd99480955ee9cfc0af4528a1966a997ab1060ec5720cec886c
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of embedded links, many of which point to external PDF files hosted on 'ansacare.com', suggesting a link farm or SEO abuse tactic. The document body and embedded URLs relate to game hacking, indicating a lure to trick users into downloading further malicious content. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

Heuristics 4

  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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/how-to-hack-roblox-wild-savannah-inf-health-hack-game-hack PDF link annotation
    • http://ansacare.com/images/free-robux-games_GM431946152.pdfIn PDF document text
    • http://ansacare.com/images/free-roebucks-com_GM431946152.pdfIn PDF document text
    • http://ansacare.com/images/robux-matchcomfree-robux_GM431946152.pdfIn PDF document text
    • http://ansacare.com/images/mcpe-master-hack-coin-apk_GM406889139.pdfIn PDF document text
    • http://ansacare.com/images/how-to-avoid-getting-hacked-on-roblox_GM431946152.pdfIn PDF document text
    • http://ansacare.com/images/free-robux-games-that-actually-work_GM431946152.pdfIn PDF document text
    • http://ansacare.com/images/make-free-robux_GM431946152.pdfIn PDF document text
    • http://ansacare.com/images/coin-master-free-spins-link-blogspot_GM406889139.pdfIn PDF document text
    • http://ansacare.com/images/roblox-speed-hack_GM431946152.pdfIn PDF document text
    • http://ansacare.com/images/can-pokemon-go-free-evolution_GM1094591345.pdfIn PDF document text
    • http://ansacare.com/images/coin-master-free-coins-links-2021_GM406889139.pdfIn PDF document text
    • http://ansacare.com/images/free-minecraft-bedrock-server-hosting_GM479516143.pdfIn PDF document text
    • http://ansacare.com/images/robux-free-gift-card-org-hack_GM431946152.pdfIn PDF document text
    • http://ansacare.com/images/coin-master-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://ansacare.com/images/www-roblox-com-robux-free_GM431946152.pdfIn PDF document text
    • http://ansacare.com/images/how-to-get-coins-in-pokemon-go-free_GM1094591345.pdfIn PDF document text
    • http://ansacare.com/images/how-to-get-free-minecraft-coins_GM479516143.pdfIn PDF document text
    • http://ansacare.com/images/pop-slots-free-vegas-casino-slot-machine-game-coin-master_GM406889139.pdfIn PDF document text
    • http://ansacare.com/images/minecraft-education-edition-free-download_GM479516143.pdfIn PDF document text
    • http://ansacare.com/images/apps-to-get-free-robux_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
stream_004_off000050d2.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x50D2 27232 bytes
SHA-256: c85eaf6aa9950ba16570e0f2e2dc17173f54b5262535c91447f5eba6662f15bc
font_01_sfnt_off00009089.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9089 19220 bytes
SHA-256: 21a2f93d72a188d132dcf92e230f1760ebc5c85bba06e9c479a3bf92f869dc1d

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