Malicious PDF — malware analysis report

Static analysis result for SHA-256 737a5fdcdf607df3…

MALICIOUS

PDF

46.8 KB Authoring application: PDF Studio
MD5: 1620e1b289a3a0541432c83bb4cfe457 SHA-1: 6b8dfb73f3055341524d56e4bfe4fc045035c687 SHA-256: 737a5fdcdf607df36e29de38c11a31a6212cb0c4cc23ea4e43528b8f8090805b
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.TtraffRobotInstall-7605656-0' and a machine learning model indicating high maliciousness. The document contains a mass external PDF link farm, with numerous URLs pointing to PDF files hosted on various domains. The presence of a 'SE_DOWNLOAD_BUTTON' heuristic suggests a call-to-action lure. While no scripts were explicitly extracted, the embedded URLs and the nature of the link farm strongly indicate a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.
  • ClamAV: Pdf.Phishing.TtraffRobotInstall-7605656-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.TtraffRobotInstall-7605656-0
  • 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 http://mystylesheets.com/uploads/1/3/0/7/130739597/dakazuji.pdf
    • http://stgeorgecountrydancing.com/uploads/1/3/0/4/130489742/c08a4.pdf
    • http://christianhartsough.com/uploads/1/3/0/5/130589415/tilafeluj.pdf
    • http://sif.kvartum.ru/uploads/2020/01/28/doxonuzamo_dusos.pdf
    • http://rafa.monnouveauportable.com/uploads/2020/01/28/putajifawirefiw-kumukev-demirowomawop-xugurokoku.pdf
    • https://bofutazi.weebly.com/uploads/1/3/0/5/130545800/duzidoleri_mefijama_ruroleran_jololujefev.pdf
    • http://puertoricandj.com/uploads/1/3/0/6/130604864/7271430.pdf
    • http://obxaerialads.com/uploads/1/3/0/6/130639062/6174799.pdf
    • http://acceleratehomeservices.com/uploads/1/3/0/6/130620957/vekebobadoleb_ninizig.pdf
    • http://ncfse.com/uploads/1/3/0/2/130273894/lukuporejokewulawale.pdf
    • http://rivendellberry.com/uploads/1/3/0/6/130604429/dapet_todutulo_rixov_wusijavomalij.pdf
    • http://kreativekidsworld.com/uploads/1/3/0/5/130539768/130539768.html#english+myanmar+speaking+mp3+free+download
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00006597.bin
8bc90a71c6867732eafeaa26597fea0c468c1febba32c4fa46d13cbb5fbb8bc3		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x6597 20144 bytes
font_00_sfnt_off000013bc.bin
2693f61c4f73455d2f260d223ae39a5b0f9f9e6ca9dfc82372e0b173909bd40a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13BC 8792 bytes

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