Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b5c95458b372f9c…

MALICIOUS

PDF

35.5 KB Created: 2021-07-05 11:05:22 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 6d5ab68e0bf13354ef164c55b59adf08 SHA-1: 5ec2d529be2766241450952e29be0ef2e41fc30f SHA-256: 3b5c95458b372f9c952bddb4638849c28880b3e5a4dd2dd354a24e82166e300c
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains numerous embedded links and a document body promoting free game currency and hacks, indicative of a phishing or scam lure. The heuristic findings confirm the presence of a link farm and external URIs, strongly suggesting the document is designed to redirect users to malicious sites. While no scripts were explicitly extracted, the nature of the content and the ML classifier's high confidence score point towards a malicious intent to exploit user interest in game cheats.

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.tw/app/431946152/how-to-get-free-robux-easy-and-real-game-hack
    • https://www.elearning.ma-alkhairiyah.sch.id/__statics/gudangsoal/files/free-robux-without-human-verification-mobile_GM431946152.pdf
    • https://www.elearning.ma-alkhairiyah.sch.id/__statics/gudangsoal/files/coin-master-hack-apk-android_GM406889139.pdf
    • https://www.elearning.ma-alkhairiyah.sch.id/__statics/gudangsoal/files/coin-master-free-spins-for-today_GM406889139.pdf
    • https://www.elearning.ma-alkhairiyah.sch.id/__statics/gudangsoal/files/cute-free-roblox-outfits_GM431946152.pdf
    • https://www.elearning.ma-alkhairiyah.sch.id/__statics/gudangsoal/files/robux-hack-no-human-verification_GM431946152.pdf
    • https://www.elearning.ma-alkhairiyah.sch.id/__statics/gudangsoal/files/inject-hack-roblox-code_GM431946152.pdf
    • https://www.elearning.ma-alkhairiyah.sch.id/__statics/gudangsoal/files/how-to-get-free-cash-on-horse-valley-beta-roblox_GM431946152.pdf
    • https://www.elearning.ma-alkhairiyah.sch.id/__statics/gudangsoal/files/free-roblox-clothes-and-hair_GM431946152.pdf
    • https://www.elearning.ma-alkhairiyah.sch.id/__statics/gudangsoal/files/coin-master-hack-to-get-free-spins_GM406889139.pdf
    • https://www.elearning.ma-alkhairiyah.sch.id/__statics/gudangsoal/files/free-diamonds-coin-master_GM406889139.pdf
    • https://www.elearning.ma-alkhairiyah.sch.id/__statics/gudangsoal/files/how-to-get-free-stuff-roblox-2021_GM431946152.pdf
    • https://www.elearning.ma-alkhairiyah.sch.id/__statics/gudangsoal/files/super-power-training-simulator-roblox-script-hack-pastebin_GM431946152.pdf
    • https://www.elearning.ma-alkhairiyah.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-without-human-verification_GM431946152.pdf
    • https://www.elearning.ma-alkhairiyah.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-fast-and-easy_GM431946152.pdf
    • https://www.elearning.ma-alkhairiyah.sch.id/__statics/gudangsoal/files/free-robux-generator-no-human-verification-2021_GM431946152.pdf
    • https://www.elearning.ma-alkhairiyah.sch.id/__statics/gudangsoal/files/free-robux-codes-2021_GM431946152.pdf
    • https://www.elearning.ma-alkhairiyah.sch.id/__statics/gudangsoal/files/how-do-you-hack-roblox_GM431946152.pdf
    • https://www.elearning.ma-alkhairiyah.sch.id/__statics/gudangsoal/files/what-to-do-when-you-are-hacked-on-roblox_GM431946152.pdf
    • https://www.elearning.ma-alkhairiyah.sch.id/__statics/gudangsoal/files/free-robux-promo-codes-november-2021_GM431946152.pdf
    • https://www.elearning.ma-alkhairiyah.sch.id/__statics/gudangsoal/files/free-roblox-shirt-templates_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00003341.bin
6b75a94a13b476faea7bb27b98a3b36e48f5b63446e92985165e923c2fbe977e		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3341 22232 bytes
font_01_sfnt_off00006493.bin
e515b27ed44a1bb81ccde538143d98cf5a205a26f57ebe02a88a1e11d502c2ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6493 19412 bytes

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