Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f1f03326c0800a8…

MALICIOUS

PDF

56.9 KB Created: 2020-08-31 23:27:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1a54c9dd7e95d713daf6c43a0f08d00e SHA-1: 9111946d4b8d0a380ff26c882f37d0c489053cb8 SHA-256: 3f1f03326c0800a8bb58a78247f9f680129692b3ccd8b8b9af3e1f64a4d5013d
152 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by an ML classifier and contains a link to a known malicious redirector, ttraff.com. It also features a large number of embedded links to other PDF files hosted on Shopify, suggesting a link farm or distribution network. The document body contains obfuscated text and a URL that appears to be part of the link farm.

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.com/pify?keyword=best+movies++dual+audio
    • https://cdn.shopify.com/s/files/1/0435/0138/7936/files/jivikutugegulogesifix.pdf
    • https://cdn.shopify.com/s/files/1/0429/9587/5989/files/58577687088.pdf
    • https://cdn.shopify.com/s/files/1/0431/4251/2791/files/75069143311.pdf
    • https://cdn.shopify.com/s/files/1/0435/8651/9195/files/85996659611.pdf
    • https://cdn.shopify.com/s/files/1/0431/7341/3032/files/kobag.pdf
    • https://cdn.shopify.com/s/files/1/0429/9322/1783/files/58835787287.pdf
    • https://cdn.shopify.com/s/files/1/0435/3009/2712/files/pwc_guide_to_doing_business_in_australia.pdf
    • https://cdn.shopify.com/s/files/1/0429/4646/1855/files/lonely_planet_paris.pdf
    • https://cdn.shopify.com/s/files/1/0434/0944/0933/files/tratamiento_brote_esclerosis_multiple.pdf
    • https://cdn.shopify.com/s/files/1/0439/9444/8030/files/shadowverse_reroll_guide.pdf
    • https://cdn.shopify.com/s/files/1/0429/6815/4278/files/wish_right_now.pdf
    • https://cdn.shopify.com/s/files/1/0434/5813/4182/files/kulunetis.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_off0000a198.bin
7b58c474fdc89f73e329079928bcf7a7dfc7719b9297d61dad10563a5c3cec40		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA198 4984 bytes
font_01_sfnt_off0000b280.bin
880c36333703b0d6cc05ecb12277d62b6b2e55fcef5e1df37b1d5c0f15138eca		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB280 10640 bytes

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