Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5300dbffbe2deec…

MALICIOUS

PDF

45.6 KB Created: 2020-08-30 08:50:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d4d91136a3596fb8828b60fcc252dbbe SHA-1: 26e47e983c0a0a284da6747378716a08b876f4b1 SHA-256: f5300dbffbe2deec10bbbad4dd3145dd37f440122757ba479bc36188035cea06
152 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, with a critical heuristic firing indicating it's a malicious redirector link farm. The primary URL, https://ttraff.me/wix?keyword=valores+de+una+panaderia, is flagged as malicious. The document body, though heavily obfuscated, contains references to this URL and other PDF links, suggesting a social engineering lure to external, potentially malicious, content. The ML classifier also strongly indicated maliciousness.

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.me/wix?keyword=valores+de+una+panaderia
    • https://static.usrfiles.com/ugd/b8c837_c45bbef8a0f44397a919c1c8866c519b.pdf
    • https://static.usrfiles.com/ugd/b8c837_0265392217ca4d0c9113f8cf1b3a9dd3.pdf
    • https://static.usrfiles.com/ugd/41a0b6_8bbf40268d404493bc49b1a8422a2ce2.pdf
    • https://cdn.shopify.com/s/files/1/0439/0486/0328/files/eminem_square_dance.pdf
    • https://cdn.shopify.com/s/files/1/0434/0521/3847/files/investor_guide.pdf
    • https://cdn.shopify.com/s/files/1/0437/8922/2045/files/pugokokibazawipovuji.pdf
    • https://cdn.shopify.com/s/files/1/0430/4620/7650/files/rakus.pdf
    • https://cdn.shopify.com/s/files/1/0435/2521/0263/files/demande_attestation_de_travail.pdf
    • https://static.usrfiles.com/ugd/225520_7f1a02ade9f349fb9f78958d21034807.pdf
    • https://static.usrfiles.com/ugd/b8c837_1db9cf71629548d7b3dc077b23ff0c00.pdf
    • https://cdn.shopify.com/s/files/1/0450/7539/8821/files/zikenosonanojazarivejemi.pdf
    • https://cdn.shopify.com/s/files/1/0432/7315/8806/files/19785729510.pdf
    • https://cdn.shopify.com/s/files/1/0432/4173/4301/files/california_fire_report_map.pdf
    • https://cdn.shopify.com/s/files/1/0427/5837/3542/files/27064409585.pdf
    • https://cdn.shopify.com/s/files/1/0431/0230/6468/files/55309321251.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006978.bin
9291c74eb72a35a0ffc079ad3472e6dc0cb6a3ba9989645975c6b16ad17c9aab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6978 4920 bytes
font_01_sfnt_off00007a32.bin
76a58bff40feaf83bfe60ae1fcc8144d56b7631b758c62029d37d7863b2c4fde		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A32 2656 bytes
font_02_sfnt_off000085b3.bin
a071980a96786665d1775b2a9a58aebbb71839f25b9e27afa08f8e5bfb622528		 pdf-font-stream PDF embedded font (sfnt) at offset 0x85B3 10892 bytes

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