Malicious PDF — malware analysis report

Static analysis result for SHA-256 69bd8f821a26c6c3…

MALICIOUS

PDF

61.8 KB Created: 2020-08-22 17:50:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 39f0f126be04c35c5864af5856fb997d SHA-1: dd029fb327662d84444e7647ccbe808d4bb135fe SHA-256: 69bd8f821a26c6c343bd2bf29004179006ddba3f2feb1d3ecbdccf56c4522aa0
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a lure related to a 'Barnsley sixth form college open day' and embeds numerous links, including a critical redirector link to 'ttraff.cc'. The presence of a link farm and the ML classifier's high confidence indicate malicious intent. The document body, though heavily obfuscated, contains the same redirector URL, suggesting it's a primary component of the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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.cc/pify?keyword=barnsley+sixth+form+college+open+day
    • http://files.investigatenyc.com/uploads/1/3/0/7/130739210/e0e88c1135.pdf
    • http://files.spacemontrose.com/uploads/1/3/0/7/130775744/9035805.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/1304/4386/files/faringitis_viral_y_bacteriana.pdf
    • https://cdn.shopify.com/s/files/1/0429/2945/5271/files/a_companion_to_econometric_analysis_of_panel_data.pdf
    • https://cdn.shopify.com/s/files/1/0431/8678/2369/files/scientific_calculator_functions_explained.pdf
    • https://cdn.shopify.com/s/files/1/0437/1965/5579/files/round_to_2_decimal_places_python.pdf
    • https://cdn.shopify.com/s/files/1/0439/5306/2046/files/chac_mool.pdf
    • https://cdn.shopify.com/s/files/1/0429/7208/6423/files/xezokisipilibodewimegax.pdf
    • https://cdn.shopify.com/s/files/1/0437/3777/6289/files/644482989.pdf
    • https://cdn.shopify.com/s/files/1/0429/0058/6649/files/migorufixowepowolab.pdf
    • https://cdn.shopify.com/s/files/1/0434/9139/3702/files/78977666077.pdf
    • https://cdn.shopify.com/s/files/1/0438/8611/7032/files/svn_to_git.pdf
    • https://cdn.shopify.com/s/files/1/0432/1627/3563/files/pusuberigerugulujum.pdf
    • https://cdn.shopify.com/s/files/1/0430/2041/9226/files/mla_format_cite_website_in_text.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_off0000b354.bin
94d4df5fd89628b1af4aecf1deff874843cd80085d2f169ba0dbaf4112ed7711		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB354 5788 bytes
font_01_sfnt_off0000c6e4.bin
6019fc37cb2344dc23f44b0dc944c2e8548b52183a4a49b762643f5c90556008		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC6E4 10396 bytes

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