Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6176eaf4011fe70…

MALICIOUS

PDF

47.6 KB Created: 2020-07-30 08:59:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ccbf638a36ee3b1745f112a92f18dfc7 SHA-1: 6c6c1a6fba8a4b2d750cab65b7632db5a6046b41 SHA-256: b6176eaf4011fe7009394241e828d3e96ef20140eef8d0144436080af9955410
152 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and heuristics indicate it contains a malicious redirector link and a large number of external PDF links, suggesting an SEO spam or traffic-driving campaign. The primary malicious URL identified is ttraff.ru, which redirects to a page related to 'treatment of type 2 diabetes mellitus pdf'. The document body is heavily obfuscated and contains metadata indicating it was generated by wkhtmltopdf.

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=treatment+of+type+2+diabetes+mellitus+pdf
    • http://files.reveil-corporel.com/uploads/1/3/0/8/130874566/fesabenovife-xekunopejibalo-kenoja-padatukowepo.pdf
    • http://files.countrylovelabradoodles.com/uploads/1/3/1/6/131607565/kapajiful.pdf
    • http://files.lucylargeart.com/uploads/1/3/0/7/130740316/zovumu_xumizexa_xetumolubujax.pdf
    • https://cdn.shopify.com/s/files/1/0431/3251/8554/files/55583601071.pdf
    • https://cdn.shopify.com/s/files/1/0432/7918/8118/files/6306080581.pdf
    • https://cdn.shopify.com/s/files/1/0428/9105/1161/files/29379747451.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/75130531250.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/55628578329.pdf
    • https://cdn.shopify.com/s/files/1/0433/8316/0995/files/65316443002.pdf
    • https://cdn.shopify.com/s/files/1/0429/3482/9223/files/dodifakasorumomozagebupa.pdf
    • https://cdn.shopify.com/s/files/1/0437/6428/5601/files/13450025265.pdf
    • https://cdn.shopify.com/s/files/1/0429/7038/2490/files/86530285665.pdf
    • https://cdn.shopify.com/s/files/1/0432/2990/5058/files/11089871434.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nuxekenosagulowagegur.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zosogorimojafi.pdf
    • https://cdn.shopify.com/s/files/1/0437/1320/0282/files/patakasolakixeber.pdf
    • https://cdn.shopify.com/s/files/1/0429/4829/6857/files/20858206005.pdf
    • https://cdn.shopify.com/s/files/1/0434/4935/2349/files/vujijemofalu.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_off00007bef.bin
2642278b963c1492a4b07deec5b00eaa35f8efa1288c99210b860dbaf5fecd6c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7BEF 5392 bytes
font_01_sfnt_off00008e2a.bin
4f97ebe9051bc5a3ab117d714a00902323ee8e8b600fecb95ee2f111d2ba0508		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8E2A 10280 bytes

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