Malicious PDF — malware analysis report

Static analysis result for SHA-256 0738a0f98bd7a09a…

MALICIOUS

PDF

38.5 KB Created: 2020-08-04 16:11:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ac8b4a3519453ee390707ece3f638f95 SHA-1: c98f4d752d289e071111b9683641b9604376d86f SHA-256: 0738a0f98bd7a09a18be12fd9fc07541baa11f8cbeff04cd543692063c1a6fb6
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, including one pointing to a known malicious redirector at 'https://ttraff.com/pify?keyword=catholic+university+of+malawi+pdf'. The document body, though heavily corrupted, appears to be a lure related to a university PDF, likely intended to trick users into clicking the malicious link. The presence of a large number of external PDF links suggests a link farm or SEO manipulation tactic.

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=catholic+university+of+malawi+pdf
    • http://files.joycecollinscoaching.com/uploads/1/3/0/8/130813108/1512003.pdf
    • http://files.frankminnella.com/uploads/1/3/0/8/130814706/c5d8d69400883b.pdf
    • http://files.josuedersoir.com/uploads/1/3/1/3/131383771/889144.pdf
    • http://files.matiastautimez.com/uploads/1/3/1/3/131379296/bulimifufi-supidilowirobup-pikedubedu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/3485/9941/files/68779635820.pdf
    • https://cdn.shopify.com/s/files/1/0430/2353/2195/files/pawawavoretukega.pdf
    • https://cdn.shopify.com/s/files/1/0431/8108/0738/files/82679571643.pdf
    • https://cdn.shopify.com/s/files/1/0435/6512/1699/files/off_line_casino.pdf
    • https://cdn.shopify.com/s/files/1/0447/5482/9463/files/2020_calendar_printable_nz.pdf
    • https://cdn.shopify.com/s/files/1/0434/5580/7654/files/ridetesewadul.pdf
    • https://cdn.shopify.com/s/files/1/0433/8237/4561/files/kubemetojilorakipep.pdf
    • https://cdn.shopify.com/s/files/1/0429/8260/4963/files/viwapurazabivi.pdf
    • https://cdn.shopify.com/s/files/1/0433/3027/3448/files/25218340243.pdf
    • https://cdn.shopify.com/s/files/1/0435/0961/2712/files/64970198862.pdf
    • https://cdn.shopify.com/s/files/1/0433/8014/6339/files/wivenowadidigatuzefa.pdf
    • https://cdn.shopify.com/s/files/1/0430/6521/3089/files/63183715083.pdf
    • https://cdn.shopify.com/s/files/1/0432/7361/7576/files/36596661723.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_off00005759.bin
a46509f7ac849a155c31a4e0bd00ef7c365b2780b9b0e2a688859c8e84655158		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5759 5556 bytes
font_01_sfnt_off00006a2d.bin
17688c77aef7071e6fb9a330fa0bd5bff1ab5f3ae9729779ba05c162f3732bc8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A2D 10128 bytes

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