Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d1e0904341c5f71…

MALICIOUS

PDF

47.6 KB Created: 2020-08-23 23:14:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 08a8eb2ae3d65b461599712075ddf963 SHA-1: a14080ad52309f736d11bc39d0abc17fbf2c8f3e SHA-256: 5d1e0904341c5f71aa7a212c3c0701e441dca56cb3b3d8a53c1804c8538f2d7a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to a redirector service (ttraff.com) that is known to host malicious content. The document body, though heavily obfuscated, contains text that appears to be a lure for fishing or other malicious activity. The ML classifier strongly indicates maliciousness, and the presence of numerous external links suggests an attempt to direct the user to further malicious sites.

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.com/pify?keyword=kanopolis+seep+stream+fishing+report
    • http://files.myportlandtherapist.com/uploads/1/3/2/8/132814589/416289.pdf
    • http://files.jrleadershipflorencecounty.com/uploads/1/3/2/8/132815298/kakijiw.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/6163/1389/files/93293717224.pdf
    • https://cdn.shopify.com/s/files/1/0432/3059/3192/files/inorganic_chemistry_books_for_msc.pdf
    • https://cdn.shopify.com/s/files/1/0431/7223/3376/files/vopanukegus.pdf
    • https://cdn.shopify.com/s/files/1/0431/8494/7357/files/68244509888.pdf
    • https://cdn.shopify.com/s/files/1/0428/1666/7815/files/95290626437.pdf
    • https://cdn.shopify.com/s/files/1/0433/7090/5750/files/89325847867.pdf
    • https://cdn.shopify.com/s/files/1/0437/7870/3521/files/functionalist_theory_of_stratification_davis_and_moore.pdf
    • https://cdn.shopify.com/s/files/1/0431/2324/5216/files/85552018716.pdf
    • https://cdn.shopify.com/s/files/1/0429/5199/9637/files/gijibonuwadawugiwimobeza.pdf
    • https://cdn.shopify.com/s/files/1/0427/9150/1990/files/pubotirudolamifonuvaxubus.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_off00007765.bin
ebace331244c44ca4ff4a55cb9aebd6ba879d3f4c420027ffb8cacf211486b25
pdf-font-stream PDF embedded font (sfnt) at offset 0x7765 5284 bytes
font_01_sfnt_off0000893c.bin
d22b973ab42960554ead3a2df47ab9feb67977de5e74b4925f448db663c966bd
pdf-font-stream PDF embedded font (sfnt) at offset 0x893C 12620 bytes