Malicious PDF — malware analysis report

Static analysis result for SHA-256 29da2ff0cb3aa4f8…

MALICIOUS

PDF

41.3 KB Created: 2020-08-16 20:30:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d69c17aba0c1de03b2e15f302721f241 SHA-1: e7b856e28046713c7bd52e1a3bf8a37317906f9b SHA-256: 29da2ff0cb3aa4f871d9023df9c3f74a2dae3b99c18b31a21944891b424ce4e0
152 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with a critical heuristic firing for a malicious redirector. The primary malicious URL identified is 'https://ttraff.cc/pify?keyword=california+king+size+bed+sheets', which is likely used to redirect users to a malicious site. Another heuristic indicates a PDF link farm, with 'https://cdn.shopify.com/s/files/1/0433/5131/0488/files/tuwowatozoz.pdf' being the first URL in this farm. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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=california+king+size+bed+sheets
    • http://files.infinitefitness.studio/uploads/1/3/1/6/131636832/getelagu-letemadamiza-dapasoluwom.pdf
    • https://cdn.shopify.com/s/files/1/0433/5131/0488/files/tuwowatozoz.pdf
    • https://cdn.shopify.com/s/files/1/0430/6989/8914/files/notikolevevilapomufikewot.pdf
    • https://cdn.shopify.com/s/files/1/0440/2446/3525/files/lettre_alphabet_francais.pdf
    • https://cdn.shopify.com/s/files/1/0432/6372/1637/files/pezejubanekigedovu.pdf
    • https://cdn.shopify.com/s/files/1/0439/2887/9272/files/letinulemekorubup.pdf
    • https://cdn.shopify.com/s/files/1/0428/7217/6796/files/vemijanetesokodokurekebu.pdf
    • https://cdn.shopify.com/s/files/1/0431/5794/6519/files/rexirositenokubuxubidenam.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_off000063a7.bin
f92bc2fdf1c18c3f8716514dca005f84336c3c1ad4a3329b983176841faca78b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63A7 5328 bytes
font_01_sfnt_off000075c6.bin
515a059407e7747122460f03a2130c53fa94572e1f007a4543eec8c249e97747		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75C6 10284 bytes

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