Malicious PDF — malware analysis report

Static analysis result for SHA-256 7183ec79cb02abea…

MALICIOUS

PDF

44.0 KB Created: 2020-09-10 07:46:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a45c6ccc53f549ce5af5615bbd0bfbd4 SHA-1: aac0d0729ce35e257f89bd3a326bf4edba3aa0ab SHA-256: 7183ec79cb02abead87b3126730e315c942985bfb7808202fb8989b5228c70b0
154 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, with the primary URL `https://ttraff.me/wix?keyword=first+grade+math+activity+sheets` identified as a malicious redirector. The heuristic `PDF_SEO_LINK_FARM` indicates a mass of external PDF links, suggesting a link farm or SEO manipulation tactic. While no scripts were extracted, the presence of numerous links and the malicious redirector strongly suggest an attempt to lure users to malicious content or exploit search engine vulnerabilities.

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.me/wix?keyword=first+grade+math+activity+sheets
    • http://garori.bohemianattic.com/uploads/1/3/1/6/131606875/xarofikum.pdf
    • http://files.holisticapproachfdc.com/uploads/1/3/1/4/131411762/zuluxux-gokomewevukak.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/822ecd_eec85e8959dd419a9122db0cabca6537.pdf
    • https://static.usrfiles.com/ugd/493135_6a0b9e8c41ae40ce8191f7924f51ae63.pdf
    • https://static.usrfiles.com/ugd/277b62_9a274f8b4c1740c18267a0b8b37fca80.pdf
    • https://static.usrfiles.com/ugd/221eaa_660d7ad96a66478e800e346a2e2db87e.pdf
    • https://cdn.shopify.com/s/files/1/0437/1070/9913/files/bronx_cablevision_tv_listings.pdf
    • https://cdn.shopify.com/s/files/1/0431/5214/6587/files/63902826852.pdf
    • https://cdn.shopify.com/s/files/1/0437/6847/9893/files/vemuwumulivoxulometak.pdf
    • https://cdn.shopify.com/s/files/1/0429/5675/1002/files/advantages_and_disadvantages_of_social_grants.pdf
    • https://cdn.shopify.com/s/files/1/0459/9218/1919/files/11-_4_conditional_probability_worksheet.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_off00006d96.bin
6a521f9345cbcd3cf012242b26a570eafea0708a7c161f828896c16e6bf8d1d3
pdf-font-stream PDF embedded font (sfnt) at offset 0x6D96 5440 bytes
font_01_sfnt_off00007ffe.bin
7d4bfd0bff47168129972cb0b59b894f938510ffbdd0c708f648feed8fd17f65
pdf-font-stream PDF embedded font (sfnt) at offset 0x7FFE 10384 bytes