Malicious PDF — malware analysis report

Static analysis result for SHA-256 4affeba455af2df0…

MALICIOUS

PDF

47.3 KB Created: 2021-05-17 12:53:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 503c4203eb5f52ccfe6a7e80edfb866f SHA-1: 8e7d3647b6d9243f50dd287227915329bb9a8c74 SHA-256: 4affeba455af2df00492bb01b2d29d8447827a8d3a9469be95336ac97c26da56
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many of which appear to be SEO-optimized for free Robux or game-related content, suggesting a link farm or phishing attempt. The presence of a direct URL to a potentially malicious application (`netcdn.xyz`) further supports this. While no scripts were explicitly extracted, the PDF structure and embedded links indicate an attempt to redirect users to malicious sites, likely as part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8948

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.xyz/app/431946152/rbxoffer-com-free-robux-game-hack
    • https://www.elearning-ganjil.massimbangkulon.sch.id/__statics/gudangsoal/files/ways-to-get-free-robux-2021_GM431946152.pdf
    • https://www.elearning-ganjil.massimbangkulon.sch.id/__statics/gudangsoal/files/coin-master-exchange-40-free-spins_GM406889139.pdf
    • https://www.elearning-ganjil.massimbangkulon.sch.id/__statics/gudangsoal/files/coin-master-free-coins-today_GM406889139.pdf
    • https://www.elearning-ganjil.massimbangkulon.sch.id/__statics/gudangsoal/files/spin-coin-master_GM406889139.pdf
    • https://www.elearning-ganjil.massimbangkulon.sch.id/__statics/gudangsoal/files/minecraft-thumbnail-maker-free_GM479516143.pdf
    • https://www.elearning-ganjil.massimbangkulon.sch.id/__statics/gudangsoal/files/minecraft-free-ios-no-verification_GM479516143.pdf
    • https://www.elearning-ganjil.massimbangkulon.sch.id/__statics/gudangsoal/files/install-coin-master_GM406889139.pdf
    • https://www.elearning-ganjil.massimbangkulon.sch.id/__statics/gudangsoal/files/avatar-the-last-airbender-roblox_GM431946152.pdf
    • https://www.elearning-ganjil.massimbangkulon.sch.id/__statics/gudangsoal/files/roblox-arsenal-hack-script-pastebin_GM431946152.pdf
    • https://www.elearning-ganjil.massimbangkulon.sch.id/__statics/gudangsoal/files/robux-generator_GM431946152.pdf
    • https://www.elearning-ganjil.massimbangkulon.sch.id/__statics/gudangsoal/files/coin-master-free-spins-link-2021-today_GM406889139.pdf
    • https://www.elearning-ganjil.massimbangkulon.sch.id/__statics/gudangsoal/files/coin-master-lucky-patcher-hack_GM406889139.pdf
    • https://www.elearning-ganjil.massimbangkulon.sch.id/__statics/gudangsoal/files/coin-master-free-spins-23-march-2021_GM406889139.pdf
    • https://www.elearning-ganjil.massimbangkulon.sch.id/__statics/gudangsoal/files/coin-master-free-gifts_GM406889139.pdf
    • https://www.elearning-ganjil.massimbangkulon.sch.id/__statics/gudangsoal/files/coin-master-cards-hack-2021_GM406889139.pdf
    • https://www.elearning-ganjil.massimbangkulon.sch.id/__statics/gudangsoal/files/free-spin-link-coin-master-today_GM406889139.pdf
    • https://www.elearning-ganjil.massimbangkulon.sch.id/__statics/gudangsoal/files/how-to-hack-roblox-2021_GM431946152.pdf
    • https://www.elearning-ganjil.massimbangkulon.sch.id/__statics/gudangsoal/files/free-coins-for-planet-master-game_GM406889139.pdf
    • https://www.elearning-ganjil.massimbangkulon.sch.id/__statics/gudangsoal/files/free-spins-on-coin-master_GM406889139.pdf
    • https://www.elearning-ganjil.massimbangkulon.sch.id/__statics/gudangsoal/files/get-free-robux-without-human-verification_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004cf6.bin
f32190b68cdbbd66eb14799b425fcad9f6f17706ee465b23b74d0bb582e37e8c		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4CF6 26000 bytes
font_01_sfnt_off00008979.bin
450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8979 5696 bytes
font_02_sfnt_off0000968a.bin
9aeb6f41d3354634239b7c8beac9b422ae3978a513a1679011b82127add4d155		 pdf-font-stream PDF embedded font (sfnt) at offset 0x968A 18276 bytes

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