Malicious PDF — malware analysis report

Static analysis result for SHA-256 16c389456081a296…

MALICIOUS

PDF

50.8 KB Created: 2020-08-12 21:29:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2568b6db29de09c7322582da4a8284b4 SHA-1: 71934cca51adb8aeb017d3d5fd8625dce20ca5dd SHA-256: 16c389456081a296310bef9f4a5a23a07ab079631235de24798830bafab44566
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm or SEO manipulation tactic. One of the primary links directs to a known malicious redirector, indicating a malicious intent to lead the user to harmful content. The ML classifier also strongly flagged this PDF as malicious.

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=medical+glossary+english+arabic+pdf
    • http://files.dragonflystrengthandfitness.com/uploads/1/3/0/7/130740573/2d8d6be36b1a487.pdf
    • http://dipujorex.adamsprgroup.com/uploads/1/3/0/8/130814328/4949701.pdf
    • http://bifosa.mayraaustinbusinesssolutions.com/uploads/1/3/1/4/131453060/rijixigum.pdf
    • http://lofefimab.detroit-limoservice.com/uploads/1/3/0/8/130874493/jetenokipebud-jodavubeke-bopozebusupixa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0441/0625/2440/files/65508436491.pdf
    • https://cdn.shopify.com/s/files/1/0439/3887/3512/files/94133714485.pdf
    • https://cdn.shopify.com/s/files/1/0432/1358/6596/files/2036587087.pdf
    • https://cdn.shopify.com/s/files/1/0430/6498/3703/files/90319054577.pdf
    • https://cdn.shopify.com/s/files/1/0427/9985/7823/files/53904485931.pdf
    • https://cdn.shopify.com/s/files/1/0435/3005/9940/files/18454685144.pdf
    • https://cdn.shopify.com/s/files/1/0432/5638/1597/files/savituxim.pdf
    • https://cdn.shopify.com/s/files/1/0431/5817/5893/files/49281202901.pdf
    • https://cdn.shopify.com/s/files/1/0434/3323/0488/files/8137571079.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/malerofefamizekigo.pdf
    • https://cdn.shopify.com/s/files/1/0428/1230/9671/files/20171515859.pdf
    • https://cdn.shopify.com/s/files/1/0432/4560/0931/files/5273794016.pdf
    • https://cdn.shopify.com/s/files/1/0431/0908/9447/files/wagedoniderab.pdf
    • https://cdn.shopify.com/s/files/1/0435/7134/7619/files/10716496235.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007a0f.bin
d9b9b6f0e6a6e99a762e1b56972af09ea7bcba01c53ce657004b9442513c9e0f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A0F 5664 bytes
font_01_sfnt_off00008d47.bin
790151d4607bcaa48bd207c64c92d91622aa04d8f5f50a379801d14cfdefd5ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D47 2856 bytes
font_02_sfnt_off00009939.bin
beb46c9868f0b09d7291433a5306dca3cc09f73542ff1340174a5fdb2b42a883		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9939 10816 bytes

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