Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b131cf207df52ba…

MALICIOUS

PDF

57.9 KB Created: 2020-08-31 07:59:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e94ddaf6e7fe3080027f998b19e7bcaa SHA-1: 716711a3e74b229b37d1e5061d0f89aea8d81a97 SHA-256: 0b131cf207df52bae551c3ca5dd99760d4bb2e9a881888d72bbbd472e2902114
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 external PDF files hosted on Shopify and other platforms. One of the primary links, 'https://ttraff.ru/wix?keyword=el+feroz+cabecilla+pdf', is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body is heavily obfuscated and appears to be a lure, possibly for SEO spam or phishing, by directing users to a network of linked documents.

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=el+feroz+cabecilla+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/2641/4749/files/77721092868.pdf
    • https://cdn.shopify.com/s/files/1/0431/4228/3432/files/lutokarewoximuke.pdf
    • https://cdn.shopify.com/s/files/1/0437/4636/1505/files/7385158892.pdf
    • https://cdn.shopify.com/s/files/1/0429/9040/3737/files/65771366142.pdf
    • https://cdn.shopify.com/s/files/1/0443/4988/2524/files/autocad_2007_free_student_version.pdf
    • https://static.usrfiles.com/ugd/b11f6d_6350960ca1a24ab8aa8dcf4d77a97d4e.pdf
    • https://static.usrfiles.com/ugd/b8c837_92460ea311c6494fae54c155528fd7d6.pdf
    • https://static.usrfiles.com/ugd/9734e7_1c7c54d90ff94568a061f9a26573293b.pdf
    • https://static.usrfiles.com/ugd/89c6ad_1f7b90ca5602491d84e4011d2bfdc2d6.pdf
    • https://static.usrfiles.com/ugd/b8c837_86529403d23d4fd38e9b14018a7b77cd.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/fixasitisajixumazurezeve.pdf
    • https://cdn.shopify.com/s/files/1/0461/9485/1993/files/antagonista_farmacologico.pdf
    • https://cdn.shopify.com/s/files/1/0438/1822/1730/files/l_encyclopdie_du_baraki.pdf
    • https://cdn.shopify.com/s/files/1/0431/3897/3857/files/basics_of_programming_language.pdf
    • https://cdn.shopify.com/s/files/1/0432/3134/6856/files/vupefikidafatujif.pdf
    • https://cdn.shopify.com/s/files/1/0432/4907/4336/files/konomoxufepuvewapezabipi.pdf
    • https://cdn.shopify.com/s/files/1/0440/7027/3174/files/bobcat_s450_specs.pdf
    • https://cdn.shopify.com/s/files/1/0430/4614/2114/files/invitation_letter_formal_template.pdf
    • https://cdn.shopify.com/s/files/1/0431/9775/9643/files/22698633042.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_off0000a265.bin
806456d1b96b1676b09bae68487aac1fba23e65204b063da1736d48fded908fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA265 5116 bytes
font_01_sfnt_off0000b3e2.bin
6f697a138127a211c507b25687b36fe2c67173c07405707ac3710ff5c4405133		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB3E2 11316 bytes

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