Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9e4ee6aca0e8ceb…

MALICIOUS

PDF

39.9 KB Created: 2020-08-14 11:59:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3117fd230cd570f19b71eb5552398dcf SHA-1: 9e9060eb5891c21eb58685da97056f5483731488 SHA-256: c9e4ee6aca0e8ceb760c55051905b79456b1794d58bf9727ea4385a12abba5ff
152 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which, 'https://ttraff.ru/pify?keyword=beamng+drive+crashes+apk', is identified as a malicious redirector. The document body, though heavily obfuscated, contains references to this URL and other benign-looking PDF links, suggesting a lure to download potentially malicious content. The ML classifier also strongly indicated maliciousness.

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=beamng+drive+crashes+apk
    • http://files.regalimagegermanshepherds.com/uploads/1/3/1/4/131483201/2318962.pdf
    • http://files.multiculturalvirtualexperience.com/uploads/1/3/2/6/132695782/duzuwabosi.pdf
    • http://files.dorabramden.com/uploads/1/3/0/7/130738644/f5d1312.pdf
    • https://cdn.shopify.com/s/files/1/0432/4029/2520/files/ignou_assignment_submission_cover_page.pdf
    • https://cdn.shopify.com/s/files/1/0438/0744/1053/files/children_s_knowledge_bank_book_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/6026/5117/files/56689890284.pdf
    • https://cdn.shopify.com/s/files/1/0434/2520/2325/files/vewojalope.pdf
    • https://cdn.shopify.com/s/files/1/0452/6263/5168/files/singapore_international_arbitration_act.pdf
    • https://cdn.shopify.com/s/files/1/0430/7006/2754/files/nijebezowoxufirari.pdf
    • https://cdn.shopify.com/s/files/1/0430/4797/7114/files/sipigijejesogif.pdf
    • https://cdn.shopify.com/s/files/1/0431/1774/0199/files/16951283701.pdf
    • https://cdn.shopify.com/s/files/1/0439/1731/2168/files/48734118164.pdf
    • https://cdn.shopify.com/s/files/1/0438/1474/8322/files/liwelobijof.pdf
    • https://cdn.shopify.com/s/files/1/0431/4087/4408/files/15904226221.pdf
    • https://cdn.shopify.com/s/files/1/0431/7990/1085/files/70972033130.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000051db.bin
5a7be0c08a658a054ba6499a1fe400b994778e0b9d85264614787e1fda184c33		 pdf-font-stream PDF embedded font (sfnt) at offset 0x51DB 5224 bytes
font_01_sfnt_off0000636a.bin
ca3e01450b86cd2eba1db6fa9fced3cc805467299e0c08d7a68a1340eb741f1a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x636A 9668 bytes
font_02_sfnt_off00008497.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8497 4324 bytes

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