Malicious PDF — malware analysis report

Static analysis result for SHA-256 57057b686152e66d…

MALICIOUS

PDF

32.5 KB Created: 2020-08-30 01:06:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f2cbbdeccb01f08d1eaafa668f53fe6c SHA-1: 23719f61739f14e52abdd8a3f972426a5929f0d9 SHA-256: 57057b686152e66d4b396633f0a63b4efca79af7348eb0a83108ed8d28316ebc
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, with a critical heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK pointing to ttraff.ru. Another critical heuristic, PDF_SEO_LINK_FARM, indicates a mass external PDF link farm. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the URL https://ttraff.ru/wix?keyword=jacob%2527+s+rebound+guide, which is likely intended to lure the user 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.ru/wix?keyword=jacob%2527+s+rebound+guide
    • https://cdn.shopify.com/s/files/1/0463/6092/0219/files/lejisojofosesu.pdf
    • https://cdn.shopify.com/s/files/1/0431/2973/3282/files/wosifolejufezu.pdf
    • https://cdn.shopify.com/s/files/1/0431/3264/9636/files/pogiginefade.pdf
    • https://cdn.shopify.com/s/files/1/0429/8581/6218/files/bamokojuranisonosop.pdf
    • https://static.usrfiles.com/ugd/913720_0f3f15dc984345df8799b96d0bdb7f30.pdf
    • https://static.usrfiles.com/ugd/d162e3_8dfb44aa4bf643db92a8b751c71dfb48.pdf
    • https://cdn.shopify.com/s/files/1/0434/2503/8498/files/kobajagukoje.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/40169505762.pdf
    • https://cdn.shopify.com/s/files/1/0435/3540/1109/files/fibiwu.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_off00004207.bin
e001a719850dfa3290e28436efdc595699dc8d02dc27a455706a8dba73ebf4e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4207 5240 bytes
font_01_sfnt_off000053d9.bin
666ee2475fc31c78f6f0f2bf544b41543da75fb302706d3a1d29dd893bdb22af		 pdf-font-stream PDF embedded font (sfnt) at offset 0x53D9 9948 bytes

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