Malicious PDF — malware analysis report

Static analysis result for SHA-256 a57ef9bfd3d126d8…

MALICIOUS

PDF

41.9 KB Created: 2020-11-02 06:35:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 10b40f54eaf91c0154f60f89fcaa7e17 SHA-1: 19a6323fdb0cffb1d8330b0048fb36638da609e0 SHA-256: a57ef9bfd3d126d8dad5271c1d87541285515772e18f20ea88703d13372a1af2
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for linking to known malicious redirector infrastructure, specifically pointing to 'ttraff.ru'. It also exhibits characteristics of a PDF link farm, with numerous embedded URLs, including 's3.amazonaws.com/tetazino/nofagako.pdf'. The document body, though heavily obfuscated, contains the malicious URL, suggesting an attempt to trick users into clicking it for information related to golf clubs.

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.ru/123?keyword=mullen+nebraska+golf+clubs
    • https://bedizegoresupa.weebly.com/uploads/1/3/1/3/131379398/zanazanekoxel.pdf
    • https://cdn-cms.f-static.net/uploads/4390637/normal_5f937f4020e47.pdf
    • https://cdn-cms.f-static.net/uploads/4365662/normal_5f8749e83feae.pdf
    • https://riwisasivituw.weebly.com/uploads/1/3/1/0/131070703/77e2531.pdf
    • https://cdn-cms.f-static.net/uploads/4402250/normal_5f934606d164b.pdf
    • https://cdn-cms.f-static.net/uploads/4365612/normal_5f88b14d50ceb.pdf
    • https://lewubudakaxawo.weebly.com/uploads/1/3/4/3/134342842/7333723.pdf
    • https://togitarusufojir.weebly.com/uploads/1/3/2/6/132681229/jikipefejegemu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/tetazino/nofagako.pdf
    • https://cdn.shopify.com/s/files/1/0503/7696/6342/files/add_blank_page_in_document.pdf
    • https://cdn.shopify.com/s/files/1/0434/7111/0310/files/crochet_patterns_for_dummies_free.pdf
    • https://uploads.strikinglycdn.com/files/2000549a-231e-419a-947e-902a4aa350b1/lisanevojogikod.pdf
    • https://s3.amazonaws.com/vuraradaso/vewibikonekowu.pdf
    • https://uploads.strikinglycdn.com/files/89391500-02e6-4b02-be33-0c88acfe01ac/fearless_by_eric_blehm_free.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_off0000658d.bin
814c6bba43ab6f3a1ea911290a6d7a6d1c47eff3a15b84c2beb01107befae7f9
pdf-font-stream PDF embedded font (sfnt) at offset 0x658D 5256 bytes
font_01_sfnt_off00007792.bin
d3783ecf4aea5c1dbe8ba05a49509cbaafc9e740a70dbf7f737105c339306d12
pdf-font-stream PDF embedded font (sfnt) at offset 0x7792 10176 bytes