Malicious PDF — malware analysis report

Static analysis result for SHA-256 9395584f9d082e59…

MALICIOUS

PDF

44.1 KB Created: 2020-08-20 22:31:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 15ddfbf6926670e41761ff2c428a48d8 SHA-1: 715079731ef608760a02815161a2ef1c4ce5ec2a SHA-256: 9395584f9d082e59984f89a4669ba0bd4025a70fd0001f1f9ab7436327e79e14
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a malicious redirector link pointing to 'ttraff.ru', disguised as a unit conversion worksheet. It also exhibits characteristics of a PDF link farm, embedding numerous external links, many of which point to Shopify domains. The ML classifier strongly indicated maliciousness, supporting the conclusion that this PDF is designed to lure 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=converting+units+of+area+and+volume+worksheet
    • http://files.trevorflett.com/uploads/1/3/1/4/131454034/2524696.pdf
    • http://files.babuni.org/uploads/1/3/0/7/130738607/bewexekix_segukowunapebe_pagifunewutuva.pdf
    • http://files.saltwaterstudios.co.uk/uploads/1/3/1/4/131405977/871831.pdf
    • http://files.newportplaza-tenant.com/uploads/1/3/1/6/131607712/jasotutigibi.pdf
    • https://cdn.shopify.com/s/files/1/0433/8876/4316/files/93220838224.pdf
    • https://cdn.shopify.com/s/files/1/0432/5271/1586/files/59431891182.pdf
    • https://cdn.shopify.com/s/files/1/0431/6063/3493/files/17162450802.pdf
    • https://cdn.shopify.com/s/files/1/0433/2614/4670/files/zunedegojelakekadi.pdf
    • https://cdn.shopify.com/s/files/1/0435/1164/4324/files/hoover_turbo_scrub_spinscrub_50_manual.pdf
    • https://cdn.shopify.com/s/files/1/0436/6820/9817/files/60809758893.pdf
    • https://cdn.shopify.com/s/files/1/0435/7311/7091/files/articles_of_faith_poster.pdf
    • https://cdn.shopify.com/s/files/1/0429/9119/0167/files/dnd_5e_acquisitions_incorporated_free.pdf
    • https://cdn.shopify.com/s/files/1/0454/7146/5624/files/66122040630.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xogasetixudaxaw.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005f2c.bin
745caa5806cfb0ee5a27cc5fc0fc0bfc7d0419b59efd3075078ca24892788b69
pdf-font-stream PDF embedded font (sfnt) at offset 0x5F2C 5440 bytes
font_01_sfnt_off00007199.bin
c6b916a3e91b5720de9ce39b858810ec38742e44ae9aa40d426251dc58c6e6bd
pdf-font-stream PDF embedded font (sfnt) at offset 0x7199 10400 bytes
font_02_sfnt_off00009507.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34
pdf-font-stream PDF embedded font (sfnt) at offset 0x9507 4324 bytes