Malicious PDF — malware analysis report

Static analysis result for SHA-256 3467ba8de9bb3f03…

MALICIOUS

PDF

38.9 KB Created: 2020-08-27 13:53:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2d5519898233a25779917fe9184fbe18 SHA-1: c8b591baa0b9ec28ee42dc8257b4865ebf9e927f SHA-256: 3467ba8de9bb3f0352e511d796d80683f27451c8989aac2a6f686d44ef81f38b
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the malicious URL and references to Microsoft, suggesting a potential lure. The primary attack pattern involves redirecting users to malicious sites.

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=microsoft+device+association+root+en
    • http://files.covespeechtherapy.com/uploads/1/3/0/8/130814258/xapovalafozusuno.pdf
    • http://dakixudem.mountainlightmusicfestival.com/uploads/1/3/0/7/130739640/5275f24a6e8.pdf
    • http://wesozup.prakritidance.com/uploads/1/3/0/8/130873782/336e3cb02.pdf
    • http://files.cityhoopsleague.com/uploads/1/3/0/7/130775653/mugazodadamiger.pdf
    • http://rofivubul.thefellowshipsite.org/uploads/1/3/1/3/131398234/lumofebe_xakofubeles.pdf
    • https://cdn.shopify.com/s/files/1/0433/5733/9813/files/pekipazubupuxevajijufafux.pdf
    • https://cdn.shopify.com/s/files/1/0430/6976/7842/files/52239226871.pdf
    • https://cdn.shopify.com/s/files/1/0439/3605/5454/files/reading_comprehension_exercises_with_answers_grade_1.pdf
    • https://cdn.shopify.com/s/files/1/0433/6300/8664/files/20194938422.pdf
    • https://cdn.shopify.com/s/files/1/0432/3383/7224/files/beneteau_first_36._7_manual.pdf
    • https://cdn.shopify.com/s/files/1/0430/9090/3193/files/gattaca_movie_study_guide.pdf
    • https://cdn.shopify.com/s/files/1/0436/0306/7044/files/88163439587.pdf
    • https://cdn.shopify.com/s/files/1/0431/4864/0418/files/xexijagurevifi.pdf
    • https://cdn.shopify.com/s/files/1/0433/9413/8277/files/somezagojofesolorapes.pdf
    • https://cdn.shopify.com/s/files/1/0433/5468/5599/files/prelude_bwv_999_guitar.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_off000059fa.bin
879bfed1d4e62d617fa896669ea8cc73c919cebf9e289923c411452abd5949c7
pdf-font-stream PDF embedded font (sfnt) at offset 0x59FA 5048 bytes
font_01_sfnt_off00006b3e.bin
6a5e06537ae4449d4117c11ecbc18db5ad6c61295c014459909a55740ac291c5
pdf-font-stream PDF embedded font (sfnt) at offset 0x6B3E 10460 bytes