Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d72469d6c874edb…

MALICIOUS

PDF

49.9 KB Created: 2020-08-05 12:23:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6b056cd2eb42712c1cd5802047dbae65 SHA-1: e4f5dd0587f3e421d7deb16b9d743a8a27f9bc9a SHA-256: 7d72469d6c874edb6154c769c80e5ca6a7147cdb906da571458791f5c8bc332b
154 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to benign Shopify URLs, but one critical link redirects to the malicious domain 'ttraff.ru'. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' confirms this redirection to known malicious infrastructure. The ML classifier also strongly flagged this PDF as malicious. The document body appears to be obfuscated or corrupted, but the presence of the malicious URL and the link farm structure indicate an attempt to lure users to malicious content, likely for phishing or malware distribution.

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=el+barril+del+amontillado+pdf
    • http://files.blue-house.org/uploads/1/3/0/7/130739532/juwugitegus.pdf
    • http://files.illinoisclimbingclub.com/uploads/1/3/1/3/131383456/jemagekatubos.pdf
    • http://files.massmediamaker.com/uploads/1/3/1/8/131871980/mijimeko-bekub-kikakede-jemuxerarotigok.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/1028/3931/files/jumejavaba.pdf
    • https://cdn.shopify.com/s/files/1/0434/4751/7341/files/53608982633.pdf
    • https://cdn.shopify.com/s/files/1/0433/8168/6439/files/xigelijurovajew.pdf
    • https://cdn.shopify.com/s/files/1/0427/7361/0663/files/migixajekup.pdf
    • https://cdn.shopify.com/s/files/1/0434/3398/4161/files/72801318205.pdf
    • https://cdn.shopify.com/s/files/1/0433/5468/5599/files/acid_base_titration_worksheet_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0431/6990/6854/files/sovisobamifelamo.pdf
    • https://cdn.shopify.com/s/files/1/0431/6377/9236/files/vusawif.pdf
    • https://cdn.shopify.com/s/files/1/0433/1828/0357/files/canard_pc_2020.pdf
    • https://cdn.shopify.com/s/files/1/0434/0989/9670/files/62855603157.pdf
    • https://cdn.shopify.com/s/files/1/0428/7463/4403/files/vabemanovebolufilis.pdf
    • https://cdn.shopify.com/s/files/1/0434/9093/4949/files/tebipabixironeroneladig.pdf
    • https://cdn.shopify.com/s/files/1/0429/4580/6503/files/38141773786.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_off00008488.bin
38976b308897d095906ec36fca044533eb17bab3c41ab9f65ec57b56cfbfdfdb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8488 5108 bytes
font_01_sfnt_off000095cf.bin
d0d72cd2a7b2fbad6d1b91116890cddd17ddb099fefe718ca4cbfddec6c5d803		 pdf-font-stream PDF embedded font (sfnt) at offset 0x95CF 11456 bytes

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