Malicious PDF — malware analysis report

Static analysis result for SHA-256 de59535533d47e40…

MALICIOUS

PDF

47.9 KB Created: 2020-08-09 14:01:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0fd194f0e859af54633cfcae176f4c8f SHA-1: 299d8d23e41ec297fe760bae71522d8e2df221db SHA-256: de59535533d47e4067bb77f677e03118ee1d68c609630f8b588b1c3220f2b187
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'ttraff.ru'. Additionally, it features a large number of external PDF links, many hosted on Shopify, suggesting a link farm or SEO manipulation tactic. The ML classifier also strongly indicated maliciousness. The embedded URL in the document body, 'https://ttraff.ru/pify?keyword=sweet+child+of+mine+guitar+chords+pdf', is the primary indicator of malicious intent, likely serving as a lure to a phishing or malware 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=sweet+child+of+mine+guitar+chords+pdf
    • http://files.oregonsiberiancats.com/uploads/1/3/1/3/131384113/sewawenejol.pdf
    • http://files.spacecityflyco.com/uploads/1/3/1/4/131437117/77de4c9.pdf
    • http://vepewu.rebekahlpurdy.com/uploads/1/3/0/9/130969723/6725903.pdf
    • https://cdn.shopify.com/s/files/1/0429/6572/9429/files/63122572328.pdf
    • https://cdn.shopify.com/s/files/1/0432/8200/6171/files/conceito_de_auditoria_externa.pdf
    • https://cdn.shopify.com/s/files/1/0431/7986/8324/files/hempel_paint_data_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0435/6145/1681/files/characteristics_of_a_project_manager.pdf
    • https://cdn.shopify.com/s/files/1/0435/0545/1174/files/1375588195.pdf
    • https://cdn.shopify.com/s/files/1/0433/7837/6853/files/buzumi.pdf
    • https://cdn.shopify.com/s/files/1/0435/1066/1279/files/vokofibijebewojexamik.pdf
    • https://cdn.shopify.com/s/files/1/0434/8795/3053/files/roman_numerals_2.pdf
    • https://cdn.shopify.com/s/files/1/0430/8199/0295/files/notowepit.pdf
    • https://cdn.shopify.com/s/files/1/0433/6975/8874/files/noxiximosafibitigeru.pdf
    • https://cdn.shopify.com/s/files/1/0434/2313/7957/files/lixalujojavezazug.pdf
    • https://cdn.shopify.com/s/files/1/0429/4190/7100/files/fapiwikelasiku.pdf
    • https://cdn.shopify.com/s/files/1/0431/6764/5852/files/75068364922.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/
    • https://cdn.shopify.com/s/fi

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007224.bin
c392f8130d34d355a4c1019542f5258c622bdbf0fe7c928a79d5361068845a8a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7224 5764 bytes
font_01_sfnt_off000085b5.bin
80433604a57fc7889abfe374be3bb6cee533a343163b6f37c1a76581af613b1f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x85B5 14084 bytes

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