Malicious PDF — malware analysis report

Static analysis result for SHA-256 58c8a603006212d1…

MALICIOUS

PDF

42.4 KB Created: 2020-08-03 12:46:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 116ad4b164e0b6bafc9fd1816e29c4c4 SHA-1: 70e65bfb613b04b3a47b0abaf212816b9aede4b6 SHA-256: 58c8a603006212d1a15eafe13b4dca75111d3fd01ba2edbc1a4717f6bbe543f2
152 Risk Score

Malware Insights

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

The PDF contains numerous links, with one specifically pointing to a known malicious redirector at `ttraff.ru`. This redirector is likely used to obscure the final destination of the malicious payload. The document body, though heavily obfuscated, contains the same malicious URL, reinforcing the intent to redirect the user. The presence of a large number of SEO-optimized PDF links suggests a link farm tactic to improve search engine ranking and distribute the malicious content.

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=ukulele+soprano+chords+pdf
    • http://files.neverweatherband.com/uploads/1/3/1/4/131437085/parex.pdf
    • http://files.frailtyprevention.co.uk/uploads/1/3/2/6/132682990/116762.pdf
    • http://files.matildameadescubittdesign.net/uploads/1/3/0/9/130969469/8378078.pdf
    • http://nelug.arom-ntu.net/uploads/1/3/0/7/130775953/derifixusowipar_lojozokefolov_rudepewasimige.pdf
    • https://cdn.shopify.com/s/files/1/0432/9370/4356/files/tojamopuwubovetuwugava.pdf
    • https://cdn.shopify.com/s/files/1/0431/7777/1164/files/jexoxidijositavi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0386/2440/files/sogazutogafegolu.pdf
    • https://cdn.shopify.com/s/files/1/0430/8136/7712/files/xadewupamutugegojogisomud.pdf
    • https://cdn.shopify.com/s/files/1/0430/6658/9335/files/lowes_eagle_pass.pdf
    • https://cdn.shopify.com/s/files/1/0433/7251/1386/files/mitefugikure.pdf
    • https://cdn.shopify.com/s/files/1/0429/1035/1513/files/tevonupigejuragim.pdf
    • https://cdn.shopify.com/s/files/1/0433/5727/4270/files/23814233056.pdf
    • https://cdn.shopify.com/s/files/1/0437/1664/0923/files/letisepofuzaziniga.pdf
    • https://cdn.shopify.com/s/files/1/0430/6888/3098/files/bilerakelitexesaj.pdf
    • https://cdn.shopify.com/s/files/1/0437/0553/2569/files/79214877640.pdf
    • https://cdn.shopify.com/s/files/1/0429/0933/5715/files/64434731936.pdf
    • https://cdn.shopify.com/s/files/1/0428/5225/3863/files/rebemonopa.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_off000066cb.bin
8f64c60c429e88ba4a962582c1c84478f38fceecaffd5fd7658a9404cc12c727		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66CB 5300 bytes
font_01_sfnt_off000078cd.bin
cbb5eba1041bee7269b987a71ea31912593e090712928f52069bd92a994740a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78CD 10536 bytes

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