Malicious PDF — malware analysis report

Static analysis result for SHA-256 be731e93469b94cb…

MALICIOUS

PDF

47.6 KB Created: 2020-08-14 02:49:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e6299c091308eb9ad5f597778be1656c SHA-1: 91349151853171066c1239e9ee3fd48b3dde2d3f SHA-256: be731e93469b94cb402fc6ab180ea4111d512b957d2c7f43fa09e9ee9613f025
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link to a known malicious redirector, ttraff.cc, which is likely used to funnel victims to malicious sites. The document also contains a large number of links to PDFs hosted on Shopify, many of which are likely part of a link farm to improve SEO for malicious content. The ML classifier strongly indicated maliciousness, supporting the presence of these malicious links.

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.cc/wb?keyword=diabetes%20tipo%20mody%20y%20lada%20pdf
    • http://vupawogo.onlytheessentialsshop.com/uploads/1/3/1/8/131856626/luzugiwunojib-gunifejajipotan-lelajap.pdf
    • http://files.milescohnrealestate.com/uploads/1/3/1/3/131398560/c40de7b85.pdf
    • http://files.southerncare.co.uk/uploads/1/3/1/3/131379792/3683773.pdf
    • http://jenenuna.meaningfuldifferences.net/uploads/1/3/1/3/131379174/2563239.pdf
    • http://files.sumikoshimada.com/uploads/1/3/2/6/132695575/b4243333be412.pdf
    • https://cdn.shopify.com/s/files/1/0430/3467/3305/files/69890418821.pdf
    • https://cdn.shopify.com/s/files/1/0432/5002/4603/files/abordagem_quantitativa.pdf
    • https://cdn.shopify.com/s/files/1/0433/6245/1611/files/javusumirezinexojire.pdf
    • https://cdn.shopify.com/s/files/1/0446/0858/5891/files/skyrim_anti_crash_mod.pdf
    • https://cdn.shopify.com/s/files/1/0437/7794/9848/files/77309288552.pdf
    • https://cdn.shopify.com/s/files/1/0440/6896/2469/files/wegurirakawokobajuwaw.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zafitizeruzu.pdf
    • https://cdn.shopify.com/s/files/1/0429/3584/5017/files/kozekaxivutapideboro.pdf
    • https://cdn.shopify.com/s/files/1/0449/4082/0635/files/64077423863.pdf
    • https://cdn.shopify.com/s/files/1/0439/5591/2862/files/luwukokukibimokopeben.pdf
    • https://cdn.shopify.com/s/files/1/0430/9640/8218/files/forutexumubisovirikosiwap.pdf
    • https://cdn.shopify.com/s/files/1/0427/6636/8935/files/subuxopere.pdf
    • https://cdn.shopify.com/s/files/1/0428/4992/7327/files/1546568595.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006f29.bin
f2a75325cabe20481a429e2b417782cd4f835e5a018a84924484b189271ce5f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F29 5332 bytes
font_01_sfnt_off0000813d.bin
ed728fa436ef5a121d27b3a8e4945b8a938e86c136578fe384bf4a249f3a5fa3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x813D 15460 bytes

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