Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdc4b8b5aa816088…

MALICIOUS

PDF

50.0 KB Created: 2020-08-23 11:57:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c8aa1910129ee2c5f4827b8c546fc528 SHA-1: ff05bd81ebe58b29c326d93acdf6a981653cfac8 SHA-256: fdc4b8b5aa8160889ba2d97082144770f7b74d424f8712e0e7ed7a646519c665
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by multiple critical heuristics for containing a malicious redirector link and a link farm. The ML classifier also strongly indicated maliciousness. The document body contains the primary malicious URL, which is likely intended to lure users to a phishing or malware distribution site. The presence of numerous links, many pointing to Shopify domains but likely serving as a cover, reinforces the link farm detection.

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.ru/pify?keyword=endo+and+exo+worksheet
    • http://files.texascityhschoir.com/uploads/1/3/2/7/132740413/wulaloda_gutof_motezovodol.pdf
    • http://files.shepherdhills.org/uploads/1/3/0/8/130874204/229c88.pdf
    • http://morobun.townofwise.net/uploads/1/3/1/8/131871721/vetenufo.pdf
    • https://cdn.shopify.com/s/files/1/0433/7473/9607/files/global_business_today_8th_edition_free.pdf
    • https://cdn.shopify.com/s/files/1/0435/5981/3279/files/xotevufus.pdf
    • https://cdn.shopify.com/s/files/1/0430/7573/1616/files/kegexar.pdf
    • https://cdn.shopify.com/s/files/1/0432/6480/2982/files/rofazomizuj.pdf
    • https://cdn.shopify.com/s/files/1/0434/2287/5797/files/49173927100.pdf
    • https://cdn.shopify.com/s/files/1/0435/7983/4531/files/xukuvegobowifeligilik.pdf
    • https://cdn.shopify.com/s/files/1/0430/2677/6227/files/zixikewemorarekinife.pdf
    • https://cdn.shopify.com/s/files/1/0431/6587/6390/files/pilusasovovupizetas.pdf
    • https://cdn.shopify.com/s/files/1/0435/3903/8360/files/phylum_actinopoda.pdf
    • https://cdn.shopify.com/s/files/1/0427/4647/8759/files/lakojifov.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006260.bin
b9c1bd2281f23f09d905494077011cda678d8ff8a20e62f41a46584ce81a564d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6260 6492 bytes
font_01_sfnt_off00007295.bin
ba01c96ef52a2a583d88a6722cdd320b65e322f09d25791ea74fefa5a977dfa3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7295 5064 bytes
font_02_sfnt_off000083de.bin
e9c11568395f4daa49b4241d287b1d4ae32eef15ef5cba0d0303d65ba5c54cb0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x83DE 9860 bytes
font_03_sfnt_off0000a580.bin
70180b97a9b9fe0de1e0c05b06d733d04658c9f7a2923a3eee6842afe753d47e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA580 16152 bytes

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