Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bfa66ad4d4a4511…

MALICIOUS

PDF

73.7 KB Created: 2020-07-13 07:37:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 95a653d5eaf9f789ac34c6c1834cf8a6 SHA-1: 774d84a016496fee120d1a8c8086a464c4df43a6 SHA-256: 0bfa66ad4d4a4511dc930e8fc4f742232917514717dec05e6d22ff00b03faab0
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many of which point to external PDF files hosted on various domains, suggesting a link farm or redirection scheme. One critical heuristic identified a link to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the structure and heuristics point towards a malicious document designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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=types+of+lines+in+engineering+drawing
    • http://files.eguastella.com/uploads/1/3/1/8/131871690/4656610.pdf
    • http://files.nanaimotreeservices.com/uploads/1/3/1/1/131164324/pazas.pdf
    • http://files.metacitrography.com/uploads/1/3/1/4/131407086/sitokif.pdf
    • http://files.bassriverchiropractic.com/uploads/1/3/0/7/130738892/gepigisavawam-mugafeli.pdf
    • http://files.imarsonline.com/uploads/1/3/1/3/131380413/6c76ebc2.pdf
    • http://files.ashleyparsonsyoga.com/uploads/1/3/2/7/132740415/newixebomufobezofawe.pdf
    • http://files.coastnuflow.com.au/uploads/1/3/1/3/131379118/nerinup.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://loxuvez.files.wordpress.com/2020/07/8723404676.pdf
    • https://nimodinuti111298458.files.wordpress.com/2020/07/rajixakurusivalulonib.pdf
    • https://raxupevifaj316168670.files.wordpress.com/2020/06/82544410002.pdf
    • https://cdn.shopify.com/s/files/1/0435/3504/0664/files/fikufefexonakedusoxosabor.pdf
    • https://cdn.shopify.com/s/files/1/0432/0015/1707/files/19270894795.pdf
    • https://cdn.shopify.com/s/files/1/0432/8462/7616/files/nuromitipumemazemozazav.pdf
    • https://cdn.shopify.com/s/files/1/0430/0223/2983/files/26555468944.pdf
    • https://cdn.shopify.com/s/files/1/0432/4684/6107/files/jezuwogaj.pdf
    • https://cdn.shopify.com/s/files/1/0430/9496/6436/files/dogofezosoxosafak.pdf
    • https://cdn.shopify.com/s/files/1/0432/0333/0209/files/44758737350.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/90685913575.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/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cfc7.bin
bdcc52a0fb48e45fdb5937c01b2d03cde0fe635224aa4993b1dacd253a0c2c3b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCFC7 5060 bytes
font_01_sfnt_off0000e11d.bin
cef67084c2c54b2398aec0f9d44b77b4dd31f56dc1214e45ca543cb37527d4df		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE11D 9964 bytes
font_02_sfnt_off00010383.bin
940e4c455b8314af7e7714c1735a8bf1dd72b3c286ac514ccc3d469e65a90f70		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10383 16172 bytes

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