Malicious PDF — malware analysis report

Static analysis result for SHA-256 78a2c7938126139c…

MALICIOUS

PDF

36.3 KB Created: 2020-08-05 11:42:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5bf24b65e4b3f76da4d029ea8ecca89a SHA-1: 18bfa9f6ef8d73c01f62e476526f7921e23ac94b SHA-256: 78a2c7938126139c1b5520092d59d976d6f9e902e56e74b87c7c1b5bb3f73abd
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm and a critical redirector link to 'ttraff.ru', indicating a malicious intent to redirect users to potentially harmful content. The document body, though obfuscated, contains the same URL and references a PDF about fractions, suggesting a lure. 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.ru/pify?keyword=adding+and+subtracting+positive+and+negative+fractions+pdf
    • http://files.lpabands.com/uploads/1/3/1/6/131636748/boxewupoje.pdf
    • http://files.nancyhallock.com/uploads/1/3/1/4/131437079/8cd74a4d.pdf
    • http://files.newhopebaptistjarrell.org/uploads/1/3/2/3/132303382/tikebofibekewo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/1024/3229/files/62822097154.pdf
    • https://cdn.shopify.com/s/files/1/0429/8860/1503/files/95471961099.pdf
    • https://cdn.shopify.com/s/files/1/0435/2226/1143/files/46829634261.pdf
    • https://cdn.shopify.com/s/files/1/0430/2825/0781/files/71989689477.pdf
    • https://cdn.shopify.com/s/files/1/0428/3963/8179/files/kogubanubivixofonomigetuf.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/23582012054.pdf
    • https://cdn.shopify.com/s/files/1/0437/7726/1729/files/dabawakewubil.pdf
    • https://cdn.shopify.com/s/files/1/0433/8316/0995/files/aws_certification_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0431/6043/6900/files/46583001589.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/2860038855.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000507a.bin
2208e7f7a2557cf7a22cdf6dfb56b7d1ade3d0d075f6d93d7d940df7d40398ee
pdf-font-stream PDF embedded font (sfnt) at offset 0x507A 5480 bytes
font_01_sfnt_off00006336.bin
96d6434bf35114e3846989b173552202fbcbae71893ea64a1fcc42118cf220ab
pdf-font-stream PDF embedded font (sfnt) at offset 0x6336 9580 bytes