Malicious PDF — malware analysis report

Static analysis result for SHA-256 c12bc1e27d34bedf…

MALICIOUS

PDF

40.4 KB Created: 2020-08-25 21:29:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0d683a1e0d26ef89931d6c120ef42085 SHA-1: f57a65546e4661fa7c794c84efe836b868f3ec08 SHA-256: c12bc1e27d34bedf00c954568da6cc8b61f97da0b3bf9aa6d32bbc1e8a880a59
152 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1566.002 Spearphishing Attachment T1071.001 Web Protocols

The PDF file was flagged as malicious by a machine learning classifier and contains a link to a known malicious redirector. The redirector URL, 'https://ttraff.cc/pify?keyword=%25D0%25BC%25D1%258F%25D1%2583%25D1%2581%25D0%25B8%25D0%25BC+%25D1%2581%25D0%25BA%25D0%25B0%25D1%2587%25D0%25B0%25D1%2582%25D1%258C+%25D0%25BD%25D0%25B0+%25D0%25BA%25D0%25BE%25D0%25BC%25D0%25BF%25D1%258C%25D1%258E%25D1%2582%25D0%25B5%25D1%2580%25D0%25B5', likely serves as a lure to a malicious site. The presence of numerous other PDF links, many hosted on Shopify, suggests a link farm or SEO poisoning attempt to distribute 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.cc/pify?keyword=%25D0%25BC%25D1%258F%25D1%2583%25D1%2581%25D0%25B8%25D0%25BC+%25D1%2581%25D0%25BA%25D0%25B0%25D1%2587%25D0%25B0%25D1%2582%25D1%258C+%25D0%25BD%25D0%25B0+%25D0%25BA%25D0%25BE%25D0%25BC%25D0%25BF%25D1%258C%25D1%258E%25D1%2582%25D0%25B5%25D1%2580%25D0%25B5
    • http://files.roundlaketheatre.com/uploads/1/3/1/4/131482886/7988350.pdf
    • https://cdn.shopify.com/s/files/1/0429/6402/5493/files/93804861011.pdf
    • https://cdn.shopify.com/s/files/1/0437/5900/9943/files/4830990671.pdf
    • https://cdn.shopify.com/s/files/1/0432/6539/2804/files/basic_biblical_hebrew_grammar.pdf
    • https://cdn.shopify.com/s/files/1/0437/1228/2789/files/kizisebabenavikar.pdf
    • https://cdn.shopify.com/s/files/1/0462/7254/4917/files/wastewater_management_information_wikipedia.pdf
    • https://cdn.shopify.com/s/files/1/0436/0224/7842/files/zugotupuxetilujafe.pdf
    • https://cdn.shopify.com/s/files/1/0433/6038/7227/files/74658018035.pdf
    • https://cdn.shopify.com/s/files/1/0431/2167/2356/files/zoxabatulifevipipuru.pdf
    • https://cdn.shopify.com/s/files/1/0430/5669/3397/files/gubodof.pdf
    • https://cdn.shopify.com/s/files/1/0435/3127/2351/files/votanakasogu.pdf
    • https://cdn.shopify.com/s/files/1/0429/3351/8489/files/lagu_wajib_bendera_merah_putih.pdf
    • https://cdn.shopify.com/s/files/1/0430/9896/4117/files/tofisisegegifobolit.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_off000055bb.bin
c860aa97f0bfe23a38b49f2e5de4edbd588d838bbe1ba947fc317413c0677d5c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x55BB 5744 bytes
font_01_sfnt_off000068dc.bin
f106943931dfe463d849c79a0528bebb572721962fb658a83ae24ae1bb5551aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68DC 13080 bytes

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