Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4199f08989ab896…

MALICIOUS

PDF

41.5 KB Created: 2020-08-29 16:58:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2e381b2428ce974f9104b285d68e859f SHA-1: c591a4d26a26ea802a3621dc1e34e3b554dcf4ee SHA-256: e4199f08989ab8961ad20ec5edd7c249a70b46cc5c63c4a386543add68ca22e8
152 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with a critical heuristic firing for a malicious redirector. The primary malicious URL identified is ttraff.ru, which is used in conjunction with a keyword suggesting a lure. The document body itself is heavily obfuscated and contains numerous URLs, many pointing to Shopify, but one critical redirector link stands out.

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=dead+cells+slasher
    • https://cdn.shopify.com/s/files/1/0429/8794/6133/files/24556767833.pdf
    • https://cdn.shopify.com/s/files/1/0437/5052/3031/files/najufuvokojuno.pdf
    • https://cdn.shopify.com/s/files/1/0439/7786/7422/files/wesepogemepitazijuzoz.pdf
    • https://cdn.shopify.com/s/files/1/0433/6985/7176/files/46034159169.pdf
    • https://cdn.shopify.com/s/files/1/0431/3792/5269/files/74183641769.pdf
    • https://cdn.shopify.com/s/files/1/0431/4015/3505/files/niwokedoveno.pdf
    • https://cdn.shopify.com/s/files/1/0436/3167/3504/files/dictionary_of_christian_theology.pdf
    • https://cdn.shopify.com/s/files/1/0438/3267/2418/files/aldehyde_and_ketone_practice_problems_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0430/3981/7890/files/40843829381.pdf
    • https://cdn.shopify.com/s/files/1/0430/6301/7629/files/duzuvobesawikitipe.pdf
    • https://cdn.shopify.com/s/files/1/0428/3885/1751/files/bridal_makeup_tutorial_step_by_step.pdf
    • https://cdn.shopify.com/s/files/1/0457/6025/0012/files/78836757008.pdf
    • https://cdn.shopify.com/s/files/1/0432/2371/1903/files/hedonismo_psicolgico.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_off00006503.bin
9055a7982b95b3527b233557700806f9edf709b78d172847467db60fbc8f134d
pdf-font-stream PDF embedded font (sfnt) at offset 0x6503 5024 bytes
font_01_sfnt_off0000760d.bin
42cb2f38abdd8579ead9e7c552e1138095f93f9bbdfebbe7106d0a33f979beac
pdf-font-stream PDF embedded font (sfnt) at offset 0x760D 10480 bytes