Malicious PDF — malware analysis report

Static analysis result for SHA-256 835fc33c6155ddd1…

MALICIOUS

PDF

44.8 KB Created: 2020-08-21 08:53:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f577a39656f285273d126b7a6d44ec64 SHA-1: 9b18c587e2353c08f7d3158f2d541bbb7ab8dc52 SHA-256: 835fc33c6155ddd16b591ea2361b164be157796e28d50af7c5861b8f5af454e1
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many pointing to Shopify domains hosting other PDFs, which is indicative of a link farm. One critical heuristic identified a link to a known malicious redirector infrastructure at `https://ttraff.ru/pify?keyword=albion+labourers+guide`. The ML classifier also strongly flagged this PDF as malicious. The presence of embedded URLs suggests an attempt to direct users to external malicious content, potentially for SEO manipulation or to host further malicious payloads.

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=albion+labourers+guide
    • http://files.jbsjewels.org/uploads/1/3/2/3/132302718/sofudezupumagoba.pdf
    • http://files.actwithpurpose.ca/uploads/1/3/1/8/131856121/tolazudofosasiruw.pdf
    • http://files.winfielddesigns.net/uploads/1/3/0/9/130969740/zirowojuzef-wavukunitumo-zorizaxadeg.pdf
    • http://files.nineonefiveapparel.com/uploads/1/3/1/4/131409761/tugezifopisij_garesa_bedigu_pezutemidemu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/3579/4327/files/91500845842.pdf
    • https://cdn.shopify.com/s/files/1/0431/1416/8480/files/lifubofufopadodil.pdf
    • https://cdn.shopify.com/s/files/1/0433/5294/8901/files/zikifunopazupid.pdf
    • https://cdn.shopify.com/s/files/1/0436/1751/7731/files/puborubisozimudon.pdf
    • https://cdn.shopify.com/s/files/1/0435/9389/2008/files/basic_modern_calligraphy_alphabet_practice_sheets.pdf
    • https://cdn.shopify.com/s/files/1/0431/1459/4464/files/77020409533.pdf
    • https://cdn.shopify.com/s/files/1/0430/9545/7941/files/bertolt_brecht_techniques.pdf
    • https://cdn.shopify.com/s/files/1/0434/2641/4749/files/72353618990.pdf
    • https://cdn.shopify.com/s/files/1/0434/2402/2680/files/wigosaduwuwafe.pdf
    • https://cdn.shopify.com/s/files/1/0440/1401/0518/files/85556712595.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007346.bin
f60714f38601bf4367d4859dd8110f7907feda8713417a83d99114e02e2d276d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7346 5120 bytes
font_01_sfnt_off000084ac.bin
49b46bab9ce0b97936df62be6721bcd4b92af1f84924a4033816eea9311505c5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x84AC 9948 bytes

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