Malicious PDF — malware analysis report

Static analysis result for SHA-256 2efffe94c67d12a4…

MALICIOUS

PDF

34.7 KB Created: 2021-06-30 00:54:51 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 71210f556054b010c4552caf248e3798 SHA-1: 87c9808e5d9e5f5058540bcc2423c32fd0f12e3d SHA-256: 2efffe94c67d12a4c8fe6252e9f1f7f048325acbdee958cde29d5c05dcba8d0a
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs and a document body that advertises "free Robux" and game hacks, strongly suggesting a lure for users to download malicious content. The ML classifier and PDF link farm heuristics indicate a high likelihood of malicious intent. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the lures point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.co/app/431946152/hack-roblox-jailbreak-2021-game-hack PDF link annotation
    • http://muslib.unmus.ac.id/repository/how-to-get-free-robux-on-phone-2021_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/how-to-get-free-robux-2021-working-august-2021_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/roblox-hack-999999-robux-2021_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/free-minecraft-mods-for-xbox-one_GM479516143.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/minecraft-linux-free_GM479516143.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/free-robux-generator-without-verification_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/what-games-work-with-cheat-engine-roblox_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/coin-master-how-to-get-free-pet-food_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/cheat-codes-for-coin-master_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/get-1-robux-free_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/how-to-hack-roblox-2021_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/nuevo-hack-generador-de-robux-de-roblox-by-pignolise_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/free-robux-money-adder-apk-2021_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/coin-master-hack-android-2021_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/does-coin-master-hack-work_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/become-a-hacker-on-roblox_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/hey-google-how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/free-robux-pin-codes_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/free-hacked-accounts-for-roblox_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/get-robux-now_GM431946152.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_off00002f28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F28 22484 bytes
SHA-256: aa8e79db9968f3c6887f1eb1089c8e8b91463320956385be05d67515f3dc31ad
font_01_sfnt_off00006160.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6160 19344 bytes
SHA-256: 4f35de93288814f2d764c63fa16aac00e830345642e7ff7fa578d7e2c9b70588

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