Malicious PDF — malware analysis report

Static analysis result for SHA-256 d957e1a180957f84…

MALICIOUS

PDF

41.4 KB Created: 2020-08-03 23:23:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ee0fe9b9a514f0bab452672d38782357 SHA-1: d86a73766ab0f7a5589fc820a200ceb80813c9bf SHA-256: d957e1a180957f842c4bc5b09ae6ea0923bb1c7998bf029e0e88f5e9fa8e2354
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external resources, forming a link farm. One critical heuristic identified a link to a known malicious redirector, ttraff.com, which is likely the primary malicious payload delivery mechanism. The document body, though obfuscated, contains text related to technical topics, suggesting a lure to entice users to click the malicious links. The ML classifier strongly supports the malicious verdict.

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.com/pify?keyword=voltage+divider+and+current+divider+rule+pdf
    • http://files.absolutedoorsct.com/uploads/1/3/0/7/130738914/3321679.pdf
    • http://files.kenziemack.com/uploads/1/3/1/4/131438464/9176425.pdf
    • http://files.nightskybooks.com/uploads/1/3/2/6/132696104/jojifofuxesupo-tuxamosi.pdf
    • http://files.praysingministry.com/uploads/1/3/2/6/132695546/f4a049ac14.pdf
    • http://files.glacial-stone.com/uploads/1/3/2/6/132681694/2204187.pdf
    • https://cdn.shopify.com/s/files/1/0431/8180/1629/files/the_curious_researcher_8th_edition_free.pdf
    • https://cdn.shopify.com/s/files/1/0432/8616/7702/files/popotiwaxezaxo.pdf
    • https://cdn.shopify.com/s/files/1/0431/6731/8167/files/github_make_new_branch.pdf
    • https://cdn.shopify.com/s/files/1/0438/1717/3152/files/siroluxipizunok.pdf
    • https://cdn.shopify.com/s/files/1/0434/0865/4492/files/bixomelebavojabopekudip.pdf
    • https://cdn.shopify.com/s/files/1/0432/3164/1762/files/32719475839.pdf
    • https://cdn.shopify.com/s/files/1/0430/6314/8706/files/betubemurosarizotezupi.pdf
    • https://cdn.shopify.com/s/files/1/0433/4986/8712/files/towofopizujugogu.pdf
    • https://cdn.shopify.com/s/files/1/0428/6890/0006/files/rupitewidenetivazego.pdf
    • https://cdn.shopify.com/s/files/1/0440/7469/6856/files/bomuxogomobutemu.pdf
    • https://cdn.shopify.com/s/files/1/0431/9703/8756/files/zidokajuzuninedamotepuf.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_off00006242.bin
fa72081c3e5bbc241965b2309f80e9810c3a3ff281d50c31130060aef857adfd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6242 5168 bytes
font_01_sfnt_off000073f9.bin
365610431771c5495252da701cae56211764a6448a579080b16fc11b97c1a27b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73F9 10672 bytes

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