Malicious PDF — malware analysis report

Static analysis result for SHA-256 892eb40b1ffa6b1f…

MALICIOUS

PDF

38.0 KB Created: 2020-08-25 17:26:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2aeea279b05f1d78dd003c99eedccd33 SHA-1: b7b23fd3a38df696ef0e304b0a2caf24c2c475f8 SHA-256: 892eb40b1ffa6b1f45fcf28db716ac6a383c8f4c3ee1b87c1e0980429071b2ca
154 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with a primary malicious redirector URL pointing to 'ttraff.com'. The document body, though heavily obfuscated, contains text related to 'Bluetooth for laptop intel' and the malicious URL, suggesting a lure to a phishing or malware distribution site. The ML classifier 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.com/pify?keyword=bluetooth+for+laptop+intel
    • http://desunepep.labattoir.org/uploads/1/3/0/8/130814328/suzabuzuzol.pdf
    • https://cdn.shopify.com/s/files/1/0429/4659/2924/files/41557596336.pdf
    • https://cdn.shopify.com/s/files/1/0432/3786/7687/files/10513730422.pdf
    • https://cdn.shopify.com/s/files/1/0434/8346/3832/files/zevugibimefowerepa.pdf
    • https://cdn.shopify.com/s/files/1/0437/8096/4510/files/xepojunozi.pdf
    • https://cdn.shopify.com/s/files/1/0427/9838/3260/files/29418478436.pdf
    • https://cdn.shopify.com/s/files/1/0434/4384/7328/files/dobavusulapisinijemi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tikifulodu.pdf
    • https://cdn.shopify.com/s/files/1/0432/3144/5149/files/gitesivukaji.pdf
    • https://cdn.shopify.com/s/files/1/0428/0595/2671/files/calendar_december_2020.pdf
    • https://cdn.shopify.com/s/files/1/0438/1566/5826/files/format_of_profit_and_loss_appropriation_account.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_off00005934.bin
f76aaba3f28f6d06158b2550c0ff2f0c29e8ce937f6c1351eee27dd320de1f11		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5934 4860 bytes
font_01_sfnt_off000069b8.bin
8bbf9ab994a099b4e06243aac5053d501c49e512cef0edfdb24a1558801d5d0b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69B8 10004 bytes

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