Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c933f24b84c6a39…

MALICIOUS

PDF

40.6 KB Created: 2020-08-01 17:51:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dc7df9630d523fa759c21534da1280c5 SHA-1: 4b5faba22273760d9e193e284e142fe64524b31a SHA-256: 8c933f24b84c6a39d36679acf83a7431374a963d621f4bed1a3054ec42230989
152 Risk Score

Malware Insights

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

The PDF was flagged for containing a large number of external links, a common tactic for SEO manipulation or redirecting users to malicious sites. One of the embedded URLs, 'https://ttraff.ru/pify?keyword=john+deere+js40', is identified as a known malicious redirector. The ML classifier also strongly indicated maliciousness.

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=john+deere+js40
    • http://files.annemariesstudio.com/uploads/1/3/1/3/131384436/25e6dc7af37.pdf
    • http://files.sarahmcintyreyoga.com/uploads/1/3/2/8/132815388/lazeleg.pdf
    • http://files.grumpypuppybarkery.com/uploads/1/3/2/3/132303163/sepolimezimuj.pdf
    • https://cdn.shopify.com/s/files/1/0429/7300/3939/files/fojerimefir.pdf
    • https://cdn.shopify.com/s/files/1/0432/2567/7982/files/vozuvimonu.pdf
    • https://cdn.shopify.com/s/files/1/0427/8996/1884/files/piwewikirazilet.pdf
    • https://cdn.shopify.com/s/files/1/0429/1336/6182/files/17367791070.pdf
    • https://cdn.shopify.com/s/files/1/0433/4980/3166/files/juvarakozolawagor.pdf
    • https://cdn.shopify.com/s/files/1/0431/0892/5600/files/20316329662.pdf
    • https://cdn.shopify.com/s/files/1/0429/4026/8711/files/12080214292.pdf
    • https://cdn.shopify.com/s/files/1/0434/1517/5335/files/28720361375.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/9142282406.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_off00006096.bin
f618623900dd5087cbd2bf9ad649572ad3a2bfc122067258964a04b68cc4b3b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6096 4964 bytes
font_01_sfnt_off0000717b.bin
2f18495f20d4b4bd37f6a3370f3cb706330866d72956955b7c3f9deefca33e18		 pdf-font-stream PDF embedded font (sfnt) at offset 0x717B 10732 bytes

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