Malicious PDF — malware analysis report

Static analysis result for SHA-256 7673ea25ead0991a…

MALICIOUS

PDF

49.7 KB Created: 2020-08-14 10:59:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4157d73bce53d9b2b5b42eb0326dca82 SHA-1: 22c5b09fb5a952865819484766420d7df5a304d3 SHA-256: 7673ea25ead0991a4946b096c1b9a58eb140cbe348c253deb5e9b2ed82a19edd
154 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to Shopify domains hosting other PDFs, suggesting a link farm or SEO manipulation tactic. One critical heuristic identified a link to known malicious redirector infrastructure at 'ttraff.ru'. The document body, though heavily obfuscated, contains the same URL, indicating an attempt to disguise malicious redirection as a book download. No scripts were extracted, but the presence of malicious links is sufficient evidence.

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=bob+lee+swagger+books+pdf
    • http://wifexolu.jonathanjohnson.net/uploads/1/3/2/8/132816066/sesutep.pdf
    • http://files.estateart.net/uploads/1/3/0/7/130774964/899d09b3da663f.pdf
    • http://forumox.herbesque.com/uploads/1/3/1/6/131637136/6716099.pdf
    • http://files.baileykidsmusicals.com/uploads/1/3/0/7/130775275/fd76a9256b224.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/7016/8992/files/42643243538.pdf
    • https://cdn.shopify.com/s/files/1/0437/7536/1178/files/72210268074.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/69901941500.pdf
    • https://cdn.shopify.com/s/files/1/0437/0608/9640/files/carbohydrates_definition_and_function.pdf
    • https://cdn.shopify.com/s/files/1/0433/6045/2760/files/tiwitetejadebepexa.pdf
    • https://cdn.shopify.com/s/files/1/0428/2499/0887/files/68833928908.pdf
    • https://cdn.shopify.com/s/files/1/0427/4028/5607/files/40554172148.pdf
    • https://cdn.shopify.com/s/files/1/0428/5209/0022/files/16597050834.pdf
    • https://cdn.shopify.com/s/files/1/0434/6285/2761/files/eclipse_stephenie_meyer.pdf
    • https://cdn.shopify.com/s/files/1/0434/6816/1184/files/nonemovuvogevipaf.pdf
    • https://cdn.shopify.com/s/files/1/0432/5149/9170/files/math_formula_algebra.pdf
    • https://cdn.shopify.com/s/files/1/0429/9912/0033/files/wunudeninuwiw.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_off000083ce.bin
6f2a5480db28e2bc6f4546776fbd3f5d0759a28f875caf8268c26596bd2ec0b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x83CE 5552 bytes
font_01_sfnt_off000096d3.bin
5312df6511884d387af5d38b5d3ea7cfef41e3b11565dac6bc04db1c01d968e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x96D3 10248 bytes

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