Malicious PDF — malware analysis report

Static analysis result for SHA-256 094a9d48d4a0762e…

MALICIOUS

PDF

42.6 KB Created: 2020-08-06 15:17:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2ef6ed701ce612afa7e05ef959771a24 SHA-1: 681d488c4656321d8d10c0c3e4a23c4b79c0f7ef SHA-256: 094a9d48d4a0762e86f46b77fe93e156d99213ac21254a8590f732402b88bd26
154 Risk Score

Malware Insights

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

The PDF document contains a link to a known malicious redirector, ttraff.ru, disguised as a test preparation document. The document also hosts a large number of links to other PDFs, likely for SEO manipulation or to spread malicious content. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to malicious infrastructure.

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=mathematical+aptitude+test+questions+and+answers+pdf
    • http://files.lauerscience.com/uploads/1/3/0/7/130776273/9366399.pdf
    • http://files.ndpharmabiotech.net/uploads/1/3/1/4/131452735/6476646.pdf
    • http://files.steveneparry.com/uploads/1/3/2/6/132681504/xadirosu.pdf
    • http://files.5ivezero.com/uploads/1/3/1/4/131437538/boxuzuzege-jamov-susaxozokusonir.pdf
    • http://files.sharalynedgeberg.org/uploads/1/3/1/4/131407164/fonobuj-besip.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/4783/7083/files/85214516725.pdf
    • https://cdn.shopify.com/s/files/1/0428/3141/3404/files/81005441786.pdf
    • https://cdn.shopify.com/s/files/1/0428/9550/7622/files/lufopivosukipekuxadob.pdf
    • https://cdn.shopify.com/s/files/1/0432/5300/6494/files/xizitoxefiwuduw.pdf
    • https://cdn.shopify.com/s/files/1/0430/2195/9325/files/82227822734.pdf
    • https://cdn.shopify.com/s/files/1/0437/9613/6097/files/suvibulokuvutap.pdf
    • https://cdn.shopify.com/s/files/1/0432/3845/7501/files/sukoridiluwajelilakugujeg.pdf
    • https://cdn.shopify.com/s/files/1/0432/3622/9278/files/najulinedebuxexepewipe.pdf
    • https://cdn.shopify.com/s/files/1/0429/1903/5033/files/calendario_octubre_2020_mexico.pdf
    • https://cdn.shopify.com/s/files/1/0435/2779/8944/files/65701794230.pdf
    • https://cdn.shopify.com/s/files/1/0432/8695/4140/files/dakawogovoke.pdf
    • https://cdn.shopify.com/s/files/1/0435/8520/8483/files/mac_os_10._12_download.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_off000067cd.bin
c5c9b7ad6f0b8ac27ee4b4c9022ebdcee0aa3a1200044ce01cbba9025eef2898		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67CD 5620 bytes
font_01_sfnt_off00007ad9.bin
3aacdfc23eb414bed08a06b21cdb8cce22eaaf6bd60b7cb2ad66c2619984132f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7AD9 9816 bytes

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