Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb72603dca2c5e56…

MALICIOUS

PDF

49.0 KB Created: 2020-08-30 21:31:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e627d70d7dd7b23b8b8cee97cd3371e9 SHA-1: 0fc69eec70f812e19a930035ffbb4717e2d60a39 SHA-256: cb72603dca2c5e566b548ecfd09af5f76570a5db5eb60de19b807e5703905ab4
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.ru/wix?keyword=big+book+pages+86+88'. The document body also contains this URL along with numerous other links to Shopify and static.usrfiles.com, suggesting a link farm or SEO poisoning attempt. The primary malicious URL is likely intended to redirect the user to a harmful site.

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=big+book+pages+86+88
    • https://cdn.shopify.com/s/files/1/0434/4836/9319/files/understanding_analysis_abbott_2nd_edition.pdf
    • https://cdn.shopify.com/s/files/1/0429/3863/0300/files/vawozivoraliwowu.pdf
    • https://cdn.shopify.com/s/files/1/0436/3023/1712/files/90254553902.pdf
    • https://cdn.shopify.com/s/files/1/0440/1122/5246/files/12082822271.pdf
    • https://cdn.shopify.com/s/files/1/0432/5592/2852/files/jaboxiwuduko.pdf
    • https://static.usrfiles.com/ugd/b8c837_8fbb4db14bcf4200b898f6145b9b1716.pdf
    • https://static.usrfiles.com/ugd/b8c837_3cefc7238c4540a884b66f684e1a503d.pdf
    • https://static.usrfiles.com/ugd/b4609a_e90233e679854e4fbf43e255be23f514.pdf
    • https://static.usrfiles.com/ugd/158fb9_fb4d61370da34a218baa98aaf17ee362.pdf
    • https://static.usrfiles.com/ugd/b8c837_c9e56c4964434c38bf0d2211db45100d.pdf
    • https://static.usrfiles.com/ugd/834936_ce534fe9c09a49b291deb9f33277b963.pdf
    • https://static.usrfiles.com/ugd/dc8a8e_bc1ae0ecb37b4fa39c5e28ab72201b73.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_off00007585.bin
5770da4a81f5dc33a084b7686cb677303f53b1b9e0db9314f611b0f305d4e50a
pdf-font-stream PDF embedded font (sfnt) at offset 0x7585 5064 bytes
font_01_sfnt_off000086ad.bin
b926b526dc296f3f4c43c3b8b43dfef60e21f2d9ded5386a15ef7dc2da90090b
pdf-font-stream PDF embedded font (sfnt) at offset 0x86AD 10192 bytes
font_02_sfnt_off0000a971.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e
pdf-font-stream PDF embedded font (sfnt) at offset 0xA971 4324 bytes