Malicious PDF — malware analysis report

Static analysis result for SHA-256 144e345d8148d306…

MALICIOUS

PDF

40.6 KB Created: 2020-08-22 06:22:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 82de85c567e055eaa372437141ed7eaa SHA-1: 6659e87c00997a93d020111ad7cc7fc4f2fb2d2d SHA-256: 144e345d8148d306543c0ee78e017677caa446e20dae65f34dff53d350e44254
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and contains a critical heuristic indicating it links to known malicious redirector infrastructure. It also exhibits characteristics of a PDF link farm, embedding a large number of external links, many of which point to Shopify domains but are likely part of a SEO spam campaign. The primary malicious URL identified is ttraff.ru, which is used in conjunction with a keyword suggesting a lure for search engine traffic.

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/pify?keyword=las+7+bellas+artes+definicion+pdf
    • http://tijexum.scsualumnibandassociation.com/uploads/1/3/0/7/130775181/816605c5f4d7383.pdf
    • http://belosi.anthonytopham.com/uploads/1/3/1/3/131380600/3f503b1db8f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/4085/7494/files/benign_paroxysmal_positional_vertigo_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0435/2396/5079/files/tudibe.pdf
    • https://cdn.shopify.com/s/files/1/0440/2629/8533/files/xumimorawuvejusi.pdf
    • https://cdn.shopify.com/s/files/1/0436/8737/9094/files/aneurisma_de_aorta_descendente.pdf
    • https://cdn.shopify.com/s/files/1/0434/1425/7820/files/96385760546.pdf
    • https://cdn.shopify.com/s/files/1/0431/8494/7357/files/83698422436.pdf
    • https://cdn.shopify.com/s/files/1/0432/6971/8172/files/donulixebutamafaje.pdf
    • https://cdn.shopify.com/s/files/1/0430/0819/6767/files/93410401740.pdf
    • https://cdn.shopify.com/s/files/1/0431/2468/7014/files/fodom.pdf
    • https://cdn.shopify.com/s/files/1/0432/3459/0878/files/62946218009.pdf
    • https://cdn.shopify.com/s/files/1/0429/0881/1427/files/71998561316.pdf
    • https://cdn.shopify.com/s/files/1/0434/8408/6424/files/85970603085.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_off0000604f.bin
278a08e3d36971a6070c2b91a421f02f33e787aa1b58f037d5cfc4f79e082ab8
pdf-font-stream PDF embedded font (sfnt) at offset 0x604F 5312 bytes
font_01_sfnt_off00007268.bin
fb05deab8ebe21f94d9fc5006456843440f7dad9f951d72a810cded52180a63c
pdf-font-stream PDF embedded font (sfnt) at offset 0x7268 10308 bytes