Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2dcbda62123c0bb…

MALICIOUS

PDF

32.4 KB Created: 2020-08-23 15:29:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f855c3ab4f257932eea30a49e5eb9bc7 SHA-1: 629d12f8ccc1d9776d3bbdc16f756645b87d8046 SHA-256: f2dcbda62123c0bb4678438b4155a16acebae12368abd70fcf803f964c267871
152 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by an ML classifier and contains numerous embedded links. A critical heuristic identified a link to a known malicious redirector service, ttraff.ru, which likely serves to obscure the ultimate malicious payload. The document body itself is largely unreadable, but the presence of many links, including one to a potentially malicious redirector, strongly suggests a phishing or malware distribution attempt.

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=bodoni+sans+font
    • http://gojezitu.pjswinkwriter.com/uploads/1/3/1/6/131606731/zupomok.pdf
    • https://cdn.shopify.com/s/files/1/0432/8439/8246/files/17372353368.pdf
    • https://cdn.shopify.com/s/files/1/0449/8993/9871/files/wuwevowexusugid.pdf
    • https://cdn.shopify.com/s/files/1/0433/2643/9582/files/sujumujusi.pdf
    • https://cdn.shopify.com/s/files/1/0434/6665/3858/files/hui_zhou_gaoshengda_technology_co._ltd.pdf
    • https://cdn.shopify.com/s/files/1/0431/1112/1063/files/2006_vw_passat_repair_manual.pdf
    • https://cdn.shopify.com/s/files/1/0430/0803/2922/files/bengal_tiger_movie_in_tamil.pdf
    • https://cdn.shopify.com/s/files/1/0434/7812/2649/files/37258041612.pdf
    • https://cdn.shopify.com/s/files/1/0439/0204/2280/files/gully_boy_movie_picture.pdf
    • https://cdn.shopify.com/s/files/1/0427/8353/9366/files/93415675199.pdf
    • https://cdn.shopify.com/s/files/1/0437/6772/6232/files/ravofedo.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_off000043af.bin
be9bd95c1bf560cff0140a22365af86adab144d50729c3ff8b307ba9a5b2e60e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x43AF 4824 bytes
font_01_sfnt_off00005426.bin
f2d43f685606e8e4cc8d9b045ee5f2aa2fa85c6c46020b4e7dae1877e6a85f9b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5426 9844 bytes

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