Malicious PDF — malware analysis report

Static analysis result for SHA-256 a65de6ea79b52f39…

MALICIOUS

PDF

43.5 KB Created: 2020-08-09 19:11:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c4c1f6e0ad13242577cc33a53d3c71a3 SHA-1: 59cc2f54a86d23ccf7dfcac28d8cc5746e642c5b SHA-256: a65de6ea79b52f399621c468d8524b71799505f3a3dc66fd7c401b68f5c3e560
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 other PDFs, constituting a link farm. One critical heuristic identified a redirector link to 'ttraff.cc', which is known malicious infrastructure. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the URL 'https://ttraff.cc/pify?keyword=washington+redskins+2020+schedule+pdf', suggesting a lure related to a schedule document that redirects to a malicious site.

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=washington+redskins+2020+schedule+pdf
    • http://jokaguki.paraglidinginperu.com/uploads/1/3/0/7/130740044/vofin.pdf
    • http://files.kingsventures.com/uploads/1/3/2/6/132696465/duzurodomekefo-foxegapuzesizi.pdf
    • http://files.tezamenzelzate.com/uploads/1/3/1/0/131069819/xesot.pdf
    • http://files.mayneislandchamber.ca/uploads/1/3/1/4/131437948/8904404.pdf
    • http://files.docairde.com/uploads/1/3/0/9/130969390/224964a9fa2475.pdf
    • https://cdn.shopify.com/s/files/1/0438/0629/4176/files/7385040042.pdf
    • https://cdn.shopify.com/s/files/1/0433/0035/6251/files/99500020991.pdf
    • https://cdn.shopify.com/s/files/1/0437/9351/4645/files/call_of_cthulhu_malleus_monstrorum.pdf
    • https://cdn.shopify.com/s/files/1/0432/5372/7387/files/ammonia_solution_msds.pdf
    • https://cdn.shopify.com/s/files/1/0430/6560/6301/files/xedekixewuzino.pdf
    • https://cdn.shopify.com/s/files/1/0428/3380/5471/files/plus_or_minus_symbol_word.pdf
    • https://cdn.shopify.com/s/files/1/0431/6912/0413/files/spatial_data_types.pdf
    • https://cdn.shopify.com/s/files/1/0434/1573/2376/files/deragenufufefexega.pdf
    • https://cdn.shopify.com/s/files/1/0435/0004/4454/files/55828426773.pdf
    • https://cdn.shopify.com/s/files/1/0430/2707/1130/files/rimopivoveg.pdf
    • https://cdn.shopify.com/s/files/1/0437/7939/1646/files/47077139554.pdf
    • https://cdn.shopify.com/s/files/1/0430/0334/7098/files/kedirude.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_off00006af4.bin
9b712c5f4f527bda439c3181f6a3a873408f61588cbf7b571265d856ed5aca09		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6AF4 5768 bytes
font_01_sfnt_off00007ea9.bin
34418cf83f276b72168ea887c68fc5386d4d2ecdef1505602057d3c1e3189dd4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7EA9 10144 bytes

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