Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f6fe25f78832791…

MALICIOUS

PDF

39.4 KB Created: 2020-09-18 03:42:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: adc232528fdb3ba72698921252e14f42 SHA-1: da088feb75396b9c431768d614670786be46f76b SHA-256: 7f6fe25f7883279163f93f97f6891c2e3a2cca73c446d4a069571d8544284820
154 Risk Score

Malware Insights

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

This PDF file contains numerous embedded links, many of which point to external PDF files hosted on various domains, suggesting a link farm or SEO abuse. One prominent URL, 'https://ttraff.club/wix?keyword=2.1+classifying+matter+answer+key', is flagged as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, indicating an attempt to lure users to malicious infrastructure. The ML classifier strongly supports the malicious verdict.

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.club/wix?keyword=2.1+classifying+matter+answer+key
    • http://files.beachstreetboutiqueapparel.com/uploads/1/3/0/7/130739835/xubaxiwik.pdf
    • http://files.fireflowerproductions.com/uploads/1/3/2/3/132303219/kodekobudegip.pdf
    • http://files.fraserlegendsfishing.com/uploads/1/3/1/4/131483305/vebodavu.pdf
    • http://gabozib.sarahinscience.com/uploads/1/3/2/6/132696067/vojowemira_gopufigulowis_fulirawiro_magimeke.pdf
    • http://nolepij.villageofbenson.com/uploads/1/3/1/3/131384055/0d1bba995.pdf
    • http://kitet.studentfinanceboard.com/uploads/1/3/1/0/131069839/vovid.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0440/6794/6648/files/jurikoxevibaki.pdf
    • https://cdn.shopify.com/s/files/1/0483/5092/0855/files/vokexusamasoxiwosamuki.pdf
    • https://cdn.shopify.com/s/files/1/0436/4668/1248/files/8336293511.pdf
    • https://cdn.shopify.com/s/files/1/0464/4788/6504/files/nobedigizagoborivupiluwuw.pdf
    • https://cdn.shopify.com/s/files/1/0437/6199/1829/files/bach_flower_remedies_book_in_tamil.pdf
    • https://cdn.shopify.com/s/files/1/0434/6730/9206/files/the_gender_tag_quiz.pdf
    • https://cdn.shopify.com/s/files/1/0429/7365/9292/files/99588497700.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_off00005a5a.bin
34b32725c6d27773651d76910d6bd2b9f471fa960780c71e2b3b164af54c5e1b
pdf-font-stream PDF embedded font (sfnt) at offset 0x5A5A 5580 bytes
font_01_sfnt_off00006d74.bin
1b2a0fbc48a8e0f831fbf2c2828f2539d15705430fdcaf3e08def85395aca77d
pdf-font-stream PDF embedded font (sfnt) at offset 0x6D74 10320 bytes