Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfdfbed528f03c36…

MALICIOUS

PDF

44.0 KB Created: 2020-08-13 19:55:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f30899228c6d421ed81e46160d95de2b SHA-1: 224691abc6d2035fbe3bd28e1e4c58813cde0ad3 SHA-256: cfdfbed528f03c36f7bb28eb32bbb207c3b7dc712d51f1d25fd849391f4ed0f2
152 Risk Score

Malware Insights

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

The PDF document was flagged by a machine learning classifier as malicious and contains numerous embedded links. One critical heuristic identified a link to a known malicious redirector service, ttraff.com, which likely serves to obscure the ultimate destination of the attack. The document also features a large link farm pointing to various PDF files, many hosted on Shopify, suggesting a tactic to generate traffic or distribute content through seemingly benign platforms. No scripts were extracted from this sample.

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/wb?keyword=missing%20numbers%20worksheet%20for%20preschool
    • http://files.kmjcounseling.com/uploads/1/3/1/6/131606073/1265916.pdf
    • http://files.raquelmeraki.com/uploads/1/3/2/7/132740860/3354846.pdf
    • http://dovitut.restorationsheridan.com/uploads/1/3/1/4/131437987/2851416.pdf
    • https://cdn.shopify.com/s/files/1/0435/5312/8612/files/sinhala_adara_katha.pdf
    • https://cdn.shopify.com/s/files/1/0432/5143/3627/files/advanced_excel_formula_file.pdf
    • https://cdn.shopify.com/s/files/1/0435/4641/1162/files/mahindra_finance_loan_application_form.pdf
    • https://cdn.shopify.com/s/files/1/0432/0608/2717/files/roxopixiguwaviv.pdf
    • https://cdn.shopify.com/s/files/1/0433/3119/0952/files/business_management_definition.pdf
    • https://cdn.shopify.com/s/files/1/0448/8301/7895/files/adjusted_odds_ratio.pdf
    • https://cdn.shopify.com/s/files/1/0431/9435/1778/files/35298877949.pdf
    • https://cdn.shopify.com/s/files/1/0433/2175/3758/files/3197357673.pdf
    • https://cdn.shopify.com/s/files/1/0438/8945/9368/files/wefikepukezaterewodopama.pdf
    • https://cdn.shopify.com/s/files/1/0432/0637/7632/files/37277884348.pdf
    • https://cdn.shopify.com/s/files/1/0430/6193/6290/files/24661179582.pdf
    • https://cdn.shopify.com/s/files/1/0430/7661/6353/files/nigovigexolel.pdf
    • https://cdn.shopify.com/s/files/1/0435/4211/8555/files/wow_classic_hunter_macros.pdf
    • https://cdn.shopify.com/s/files/1/0438/3119/7856/files/goduzezubu.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_off00006af3.bin
1a69c06413ae93879bf78c75d5da6414958789a45c3085bd2574c477c641433b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6AF3 5520 bytes
font_01_sfnt_off00007daa.bin
5d3b3035f5491ca35653d1f34a34c4a0dad990647d1d060c6b5d30f4f5decd50		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7DAA 10924 bytes

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