Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c5c8b45a10bc6a0…

MALICIOUS

PDF

45.4 KB Created: 2020-07-31 13:25:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ef2f98fcd27be505c3d055b98ec6e951 SHA-1: 89f37d2742098ab3a964ffc7c468920762112762 SHA-256: 2c5c8b45a10bc6a0c05e0de9cda78439977bb186e4a9b6091bc8f0d606300455
152 Risk Score

Malware Insights

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

The PDF contains a high number of embedded links, many pointing to Shopify domains, suggesting an attempt at SEO poisoning to drive traffic to malicious sites. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.ru/pify?keyword=alien+isolation+guide+pdf'. The ML classifier also strongly indicated maliciousness. The document body is heavily obfuscated, preventing a clear understanding of its direct lure, but the link farm and redirector are strong indicators of a malicious distribution pattern.

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=alien+isolation+guide+pdf
    • http://files.clintoncountycasa.org/uploads/1/3/2/7/132740193/a58e93.pdf
    • http://files.mskenny.com/uploads/1/3/0/7/130776407/pemopotofoso.pdf
    • http://files.obsidianliving.co.uk/uploads/1/3/1/6/131636984/vetigezusa.pdf
    • http://files.ili360.org/uploads/1/3/0/8/130814169/dopidel_nubafo_goxoz_fotuzuxepu.pdf
    • http://files.yanka-online.com/uploads/1/3/2/8/132814791/vilos-wonuzisenejawe.pdf
    • http://files.clintoncoun
    • https://cdn.shopify.com/s/files/1/0437/0199/3622/files/82860585264.pdf
    • https://cdn.shopify.com/s/files/1/0430/8851/1130/files/lijajikegobibu.pdf
    • https://cdn.shopify.com/s/files/1/0437/3712/0933/files/58827392491.pdf
    • https://cdn.shopify.com/s/files/1/0430/8451/3440/files/mezopiwuru.pdf
    • https://cdn.shopify.com/s/files/1/0431/0820/4704/files/81397449478.pdf
    • https://cdn.shopify.com/s/files/1/0434/5731/4977/files/tiwozomapotedoxofawesakas.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/59854739703.pdf
    • https://cdn.shopify.com/s/files/1/0427/6905/5911/files/23977349351.pdf
    • https://cdn.shopify.com/s/files/1/0434/5672/5159/files/paxusesotukezovisa.pdf
    • https://cdn.shopify.com/s/files/1/0431/6699/0498/files/zojat.pdf
    • https://cdn.shopify.com/s/files/1/0431/0908/9447/files/74350839201.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_off0000747f.bin
b3ebc0a814b451f3f38de29ed6729d71097b97973d593aedb6982bf9819b2e52		 pdf-font-stream PDF embedded font (sfnt) at offset 0x747F 4984 bytes
font_01_sfnt_off0000858c.bin
c7cdf6aeba578e9340608847f4eef423c9f8d28bea5acd37167c106052469ca5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x858C 10348 bytes

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