Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6a3bb7551cb8bba…

MALICIOUS

PDF

40.8 KB Created: 2020-08-08 09:48:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b9cc25de664efa22ecc09896bc147859 SHA-1: 2937027977a3ab0acb5689adc959b4023b3370d3 SHA-256: d6a3bb7551cb8bba65e40e1c81df1599db4d14fbcd8c145e847abf7996c916b7
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a mass external link farm, with a primary link to a known malicious redirector. The document body, though heavily obfuscated, contains the URL that leads to the redirector, suggesting a lure for users seeking a free PDF download. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://ttraff.cc/pify?keyword=ramayana+full+story+in+english+pdf+free+download
    • http://files.tagis.pt/uploads/1/3/1/1/131164122/4731765.pdf
    • http://files.d-team.info/uploads/1/3/1/4/131453555/fulivegime_dijonaxaxelela_xidawajola.pdf
    • http://files.dukeengagedetroit.org/uploads/1/3/0/7/130775958/vopija.pdf
    • http://files.gettinoutdoorsradio.com/uploads/1/3/1/0/131070501/3498424.pdf
    • https://cdn.shopify.com/s/files/1/0428/7679/7081/files/57928596761.pdf
    • https://cdn.shopify.com/s/files/1/0434/6488/4384/files/witepi.pdf
    • https://cdn.shopify.com/s/files/1/0440/1889/2958/files/42773283476.pdf
    • https://cdn.shopify.com/s/files/1/0434/4256/9368/files/53196714677.pdf
    • https://cdn.shopify.com/s/files/1/0428/2020/6758/files/42827439542.pdf
    • https://cdn.shopify.com/s/files/1/0430/4178/3959/files/47952870350.pdf
    • https://cdn.shopify.com/s/files/1/0429/1392/3228/files/26987616654.pdf
    • https://cdn.shopify.com/s/files/1/0432/0870/4164/files/breadth_first_search.pdf
    • https://cdn.shopify.com/s/files/1/0436/4166/7734/files/nulobigemenibipubaju.pdf
    • https://cdn.shopify.com/s/files/1/0430/9201/7305/files/9580761829.pdf
    • https://cdn.shopify.com/s/files/1/0432/2790/6206/files/79266698825.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005f8b.bin
ee2633b31e3fef8d27147ff1f4efa60cae6621117c943899c2127e235c89d883		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F8B 5656 bytes
font_01_sfnt_off000072bf.bin
f6ec3f16cab91f08efab5443e61b1c25cd8251828cd551e70f94f4d4bad69f2e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72BF 10352 bytes

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