Malicious PDF — malware analysis report

Static analysis result for SHA-256 640b9cda70d215cc…

MALICIOUS

PDF

47.3 KB Created: 2020-09-02 03:23:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3c7a1c29c93caf6a4cd1f2799c95367e SHA-1: 0ef1cea92ef3c874029302e715a731a268cb0498 SHA-256: 640b9cda70d215cc7f9cb9e329cf79a54c9fcdc5075a22e5c5ef8563f98c0e7b
154 Risk Score

Malware Insights

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

The PDF contains embedded links and text that mimic search results for 'ssc admit card 2019 bangladesh'. One of these links, 'https://ttraff.ru/wix?keyword=ssc+admit+card+2019++bangladesh', is identified as a malicious redirector. The PDF also features a large number of links to Shopify-hosted PDFs, suggesting a link farm or SEO manipulation tactic. The ML classifier strongly indicates maliciousness.

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=ssc+admit+card+2019++bangladesh
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/2045/1997/files/xonotazekuvuvipi.pdf
    • https://cdn.shopify.com/s/files/1/0433/9364/6753/files/kavijefipok.pdf
    • https://cdn.shopify.com/s/files/1/0449/0487/4151/files/bipasosekagab.pdf
    • https://cdn.shopify.com/s/files/1/0435/3222/2615/files/black_and_decker_7447_belt_sander_manual.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/65529241957.pdf
    • https://cdn.shopify.com/s/files/1/0429/0609/1673/files/arcs_and_central_angles_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0433/9980/7126/files/34918727608.pdf
    • https://cdn.shopify.com/s/files/1/0438/7618/8315/files/jdbctemplate_named_parameters.pdf
    • https://cdn.shopify.com/s/files/1/0429/1903/5033/files/algebra_questions_for_cat.pdf
    • https://cdn.shopify.com/s/files/1/0430/0357/6481/files/wokuvopa.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/30072581460.pdf
    • https://cdn.shopify.com/s/files/1/0431/4536/3610/files/90337244178.pdf
    • https://cdn.shopify.com/s/files/1/0439/4788/4699/files/68654360075.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_off00006f86.bin
7206fbb20ddf5bf27357369cfe5988691a7daa6661999c2f7651a519e27981fb
pdf-font-stream PDF embedded font (sfnt) at offset 0x6F86 6080 bytes
font_01_sfnt_off00008401.bin
86ee7b66d8e1e9876987b2ffc9ed8f061daf4a91a8bbbbbb95cc9728103ecfe4
pdf-font-stream PDF embedded font (sfnt) at offset 0x8401 14340 bytes