Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4ca086731d3a206…

MALICIOUS

PDF

34.7 KB Created: 2020-08-17 08:45:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cfdc193ed0540911e762746ffe706919 SHA-1: 3e2fbb9af1675d220c8d671bc60c89f080d31bf0 SHA-256: e4ca086731d3a2066a890a03e8daa852d25a14410d6d0aeff4e679fb7b6ed2df
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'ttraff.ru'. The document body, though heavily obfuscated, also contains this URL and numerous other links hosted on Shopify, suggesting a link farm or redirection strategy. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to redirect users to harmful content.

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=ill+guided+synonym
    • http://tolikuba.nomomani.com/uploads/1/3/2/6/132682883/9a1eb91938d.pdf
    • https://cdn.shopify.com/s/files/1/0438/8497/0139/files/degebagoxinadomix.pdf
    • https://cdn.shopify.com/s/files/1/0433/0094/6073/files/50891927641.pdf
    • https://cdn.shopify.com/s/files/1/0434/7245/3797/files/94646786452.pdf
    • https://cdn.shopify.com/s/files/1/0427/9068/2783/files/character_animation_books.pdf
    • https://cdn.shopify.com/s/files/1/0436/0624/5534/files/nhl_hockey_score_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/pafinekumukomotutawewokab.pdf
    • https://cdn.shopify.com/s/files/1/0439/0731/7912/files/negative_prefixes_to_form_antonyms_list.pdf
    • https://cdn.shopify.com/s/files/1/0431/5168/7848/files/76043135573.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_off00004bd7.bin
337227796b940f43cf08d79d01f8a89eebd64d2adc4156efd0d7dd0814b70c24		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4BD7 4880 bytes
font_01_sfnt_off00005c64.bin
0ea5729a5189ced5bee0430f8ca7471e1559db8e75cb31d57a023aca4be3250a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C64 10128 bytes

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