Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0eca5fda73e992a…

MALICIOUS

PDF

40.2 KB Created: 2020-08-19 06:53:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: df156eee3bbeca5bdb84fe40903c7b96 SHA-1: aee653d765cedfe15cc2c42e97ca7b22d6f5e5b2 SHA-256: c0eca5fda73e992a2a5a56e29a9d0459b23d542eb82c197644f31371ae894688
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 Shopify domains hosting seemingly benign PDFs. However, one critical heuristic firing indicates that the PDF links to known malicious redirector infrastructure, specifically 'ttraff.cc', which is used to lure users to malicious sites. The document body, though heavily obfuscated, contains the string 'simplified badminton rules pdf' and the malicious URL, suggesting a lure to trick users into clicking the links. The ML classifier also strongly flagged this PDF as malicious.

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=simplified+badminton+rules+pdf
    • http://maxaneji.darcyrylander.com/uploads/1/3/0/7/130776167/dccab89b083.pdf
    • http://migowija.sarahrosepeterson.net/uploads/1/3/1/4/131483281/wevemozinevevogaxa.pdf
    • http://files.jewelrysalehub.com/uploads/1/3/1/4/131452803/dofamopomasi_liwam_zaker.pdf
    • http://xiparovin.jrcentrepieces.co.uk/uploads/1/3/1/3/131379598/d7421f4b7056a.pdf
    • https://cdn.shopify.com/s/files/1/0432/9455/6320/files/kezew.pdf
    • https://cdn.shopify.com/s/files/1/0434/5433/3093/files/68588136426.pdf
    • https://cdn.shopify.com/s/files/1/0434/8477/4552/files/86389230207.pdf
    • https://cdn.shopify.com/s/files/1/0428/4622/4551/files/nisumidasesusefetit.pdf
    • https://cdn.shopify.com/s/files/1/0432/0277/3156/files/43759361726.pdf
    • https://cdn.shopify.com/s/files/1/0434/0908/0477/files/wawefoditalegoz.pdf
    • https://cdn.shopify.com/s/files/1/0433/4852/5206/files/82281615302.pdf
    • https://cdn.shopify.com/s/files/1/0438/0160/8353/files/guide_itinraire_michelin_2018.pdf
    • https://cdn.shopify.com/s/files/1/0429/2637/5071/files/dapulinijivebo.pdf
    • https://cdn.shopify.com/s/files/1/0430/3015/1330/files/westpac_business_online_application_form.pdf
    • https://cdn.shopify.com/s/files/1/0437/8879/6065/files/diweserixazipanomafetoxol.pdf
    • https://cdn.shopify.com/s/files/1/0434/0344/4380/files/kezoto.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_off0000617f.bin
132cbfc3f3f66fce71454810b095441e105fef13ec84c983a2be5113c8681b4b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x617F 5428 bytes
font_01_sfnt_off000073d0.bin
0ec0da4f50d15c489aa019a8f7c4c808b92279bb3a77b1adc4e7be21f18e1c30		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73D0 9564 bytes

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