Malicious PDF — malware analysis report

Static analysis result for SHA-256 511bded554dc6ab3…

MALICIOUS

PDF

52.3 KB Created: 2020-08-06 04:16:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1becf9bb7ce4e36f4977813e51be1469 SHA-1: 6c4fbb539b81973759e74e1f5788ebc87b137c3f SHA-256: 511bded554dc6ab32fd8fd9d1084be63a0951b811f4fc2a52d6601dcf50d206f
152 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to a known malicious domain, ttraff.ru. This domain is used in a link farm strategy, likely to obscure the final malicious destination. The document body, though heavily obfuscated, contains text referencing 'analytical skills for decision making pdf' and the malicious URL, suggesting a lure to a phishing or malware distribution site.

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=analytical+skills+for+decision+making+pdf
    • http://files.schoolontherise.com/uploads/1/3/0/7/130775431/9840034.pdf
    • http://files.nadermakki.com/uploads/1/3/0/7/130775607/2325965.pdf
    • http://ferokew.jccaportland.com/uploads/1/3/1/4/131452977/jaworozewowoke-naxojiwijem-vimikuvotinizow.pdf
    • https://cdn.shopify.com/s/files/1/0431/5856/9120/files/49668240937.pdf
    • https://cdn.shopify.com/s/files/1/0427/8799/5807/files/27712424460.pdf
    • https://cdn.shopify.com/s/files/1/0431/6472/9512/files/81094635547.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/40169505762.pdf
    • https://cdn.shopify.com/s/files/1/0434/7173/2889/files/37600044799.pdf
    • https://cdn.shopify.com/s/files/1/0432/5238/3904/files/estimation_and_costing_of_building.pdf
    • https://cdn.shopify.com/s/files/1/0434/7602/5497/files/manopigenewenuvaraxuweber.pdf
    • https://cdn.shopify.com/s/files/1/0432/7243/7910/files/lokegajuxidonanibupiri.pdf
    • https://cdn.shopify.com/s/files/1/0435/3985/7563/files/14537367382.pdf
    • https://cdn.shopify.com/s/files/1/0437/6743/1320/files/nutrition_definition_biology.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_off00008c40.bin
045e04c72b0efaa437ef59c2932e654dcb4c659a1acad37fec36ae2ca725dc22
pdf-font-stream PDF embedded font (sfnt) at offset 0x8C40 5632 bytes
font_01_sfnt_off00009f66.bin
08344206fc587c62d9cb68ead091f51bef003cff539c5f1d77282dad83785221
pdf-font-stream PDF embedded font (sfnt) at offset 0x9F66 10720 bytes