Malicious PDF — malware analysis report

Static analysis result for SHA-256 faf4bbac2c9498e1…

MALICIOUS

PDF

49.1 KB Created: 2020-08-02 09:52:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1b8af08f62c09103b6a821dcd9852f32 SHA-1: f2f29a6bbaf3c982d0cb12c85cb54a79648bf250 SHA-256: faf4bbac2c9498e112c0c180290ae99a6f9499070dd3d2fffcc187349187515e
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.ru, which is likely used to obscure the final destination of the malicious payload. The document body, though heavily obfuscated, contains the same URL, suggesting it's the primary lure. The heuristic PDF_SEO_LINK_FARM indicates a large number of outbound links, many pointing to Shopify domains, likely to improve search engine ranking for malicious content. No scripts were extracted from this sample.

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=shure+slx4+manual
    • http://files.grampcity.org/uploads/1/3/0/8/130873715/dopegujeputef.pdf
    • http://files.worldofpeaceandlove.com/uploads/1/3/0/9/130969312/498de746ddf09.pdf
    • http://files.scharencycles.com/uploads/1/3/0/7/130776118/ginukaxezunat.pdf
    • http://files.santafest.ca/uploads/1/3/1/4/131453252/fcf953.pdf
    • https://cdn.shopify.com/s/files/1/0432/8259/6008/files/54332541022.pdf
    • https://cdn.shopify.com/s/files/1/0432/8688/8612/files/2713047766.pdf
    • https://cdn.shopify.com/s/files/1/0431/2743/9526/files/naxujowuzufis.pdf
    • https://cdn.shopify.com/s/files/1/0429/9912/0033/files/kixatiburibimopuko.pdf
    • https://cdn.shopify.com/s/files/1/0431/7279/0432/files/53634042847.pdf
    • https://cdn.shopify.com/s/files/1/0433/1310/2998/files/lepopapipatur.pdf
    • https://cdn.shopify.com/s/files/1/0428/8148/2919/files/nuteze.pdf
    • https://cdn.shopify.com/s/files/1/0431/5794/6522/files/9153256107.pdf
    • https://cdn.shopify.com/s/files/1/0438/4958/0704/files/xogodokuvikapum.pdf
    • https://cdn.shopify.com/s/files/1/0429/5095/1066/files/12627983692.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_off00008045.bin
2b4503a13884b0d8c874356941a05697e40620c771a2a5fb2a2b01f967f4c4bf
pdf-font-stream PDF embedded font (sfnt) at offset 0x8045 5184 bytes
font_01_sfnt_off000091bc.bin
60c8e2c0cff5b69833ed1c558914e312025166339c6923f876a514d832937e06
pdf-font-stream PDF embedded font (sfnt) at offset 0x91BC 11328 bytes