Malicious PDF — malware analysis report

Static analysis result for SHA-256 6acf2dd6d495a5d2…

MALICIOUS

PDF

31.7 KB Created: 2020-08-15 07:28:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 712d5b27e5288aba7f27a2d9b5b8a066 SHA-1: 0bdf88f19f70658e909c7ef5126a66848be383bf SHA-256: 6acf2dd6d495a5d24917ffaa189bfade9b69b7d69f6b948c166dda3162ae73f6
154 Risk Score

Malware Insights

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

The PDF contains numerous links, including one pointing to a known malicious redirector at 'ttraff.com'. The document body and embedded links suggest a lure related to academic worksheets, likely intended to trick users into clicking the malicious link. The presence of multiple external links, many pointing to benign Shopify URLs, indicates a potential SEO link farm tactic to obscure the malicious destination.

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=ionic+bonding+worksheet+doc
    • http://files.agape-international.org/uploads/1/3/1/3/131398487/gebelopeponudo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/2159/6834/files/calculus_with_applications_11th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0429/5560/4124/files/anatomy_and_physiology_for_biomedical_engineers.pdf
    • https://cdn.shopify.com/s/files/1/0429/8260/4963/files/zujigunaruwif.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/98223768302.pdf
    • https://cdn.shopify.com/s/files/1/0440/2626/5765/files/88384679683.pdf
    • https://cdn.shopify.com/s/files/1/0430/5246/6325/files/oxidation_and_reduction_examples.pdf
    • https://cdn.shopify.com/s/files/1/0432/7197/9171/files/pubivutil.pdf
    • https://cdn.shopify.com/s/files/1/0429/6137/1290/files/pimifum.pdf
    • https://cdn.shopify.com/s/files/1/0435/9805/3535/files/11673135280.pdf
    • https://cdn.shopify.com/s/files/1/0440/2728/1558/files/how_to_win_cracker_barrel_game.pdf
    • https://cdn.shopify.com/s/files/1/0427/6404/2396/files/90532154031.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_off0000404c.bin
6349fb2cc28daa8f2bbbbce45a9b0e12f4499e1658fe41b69ca923f0fb916853
pdf-font-stream PDF embedded font (sfnt) at offset 0x404C 5192 bytes
font_01_sfnt_off000051fd.bin
ce7c81eba287a9fada2712a478e1923077c79d82859ce9579bc5deaad46d04c7
pdf-font-stream PDF embedded font (sfnt) at offset 0x51FD 9580 bytes