Malicious PDF — malware analysis report

Static analysis result for SHA-256 1dafdc9a6d111637…

MALICIOUS

PDF

31.8 KB Created: 2020-08-30 06:43:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 17e34f450420d91ad36e2ef1f617712b SHA-1: 5cf1599d0fd0b91f8b1d539c0d8677595cf6a9ab SHA-256: 1dafdc9a6d1116372add1160cb5ec3b4be696f83ab2c3d30bf2daaef4942542e
152 Risk Score

Malware Insights

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

The PDF contains a mass of external links, including a critical link to a known malicious redirector at 'https://ttraff.club/wix?keyword=abb+ac800f+manual+pdf'. The document body, though heavily obfuscated, contains this URL and other links to PDF files hosted on Shopify, suggesting a link farm designed to appear legitimate. The ML classifier strongly indicated maliciousness, supporting the conclusion that this PDF is part of a malicious campaign.

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.club/wix?keyword=abb+ac800f+manual+pdf
    • https://cdn.shopify.com/s/files/1/0439/2311/2104/files/auto_service_repair_manuals_free.pdf
    • https://cdn.shopify.com/s/files/1/0437/7939/1646/files/86210841316.pdf
    • https://cdn.shopify.com/s/files/1/0450/4079/5806/files/aristolochia_bracteata.pdf
    • https://static.usrfiles.com/ugd/8c0e65_caec13dd44ec478f8f3e6420272c80da.pdf
    • https://static.usrfiles.com/ugd/b8c837_3085020aa0f5482d9b86b8fde5c99ee7.pdf
    • https://cdn.shopify.com/s/files/1/0434/2585/7703/files/69126012952.pdf
    • https://cdn.shopify.com/s/files/1/0432/8731/4585/files/veluxowoxulawulipo.pdf
    • https://cdn.shopify.com/s/files/1/0431/4402/0125/files/xilikoripefisiroralep.pdf
    • https://cdn.shopify.com/s/files/1/0427/5562/1031/files/40107130315.pdf
    • https://cdn.shopify.com/s/files/1/0436/1935/2740/files/different_types_of_aircraft_engines.pdf
    • https://cdn.shopify.com/s/files/1/0438/5298/8566/files/puxoteb.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004098.bin
0c67b4d3765af6dd0df86fc2841d6b268a0693170a377bf0cff86f33fa6a6e23
pdf-font-stream PDF embedded font (sfnt) at offset 0x4098 5492 bytes
font_01_sfnt_off00005324.bin
de204e46a94bb5302b7aa5e0c5e927320fb861cf835dc6ca88ef935dfb29d3e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x5324 9300 bytes