Malicious PDF — malware analysis report

Static analysis result for SHA-256 10c760e8a106eb9a…

MALICIOUS

PDF

40.3 KB Created: 2020-08-04 21:16:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 26d9171bd47589bcac496439cbf16e0e SHA-1: 78267d015ac6be351e896877802f192edc6f6b2a SHA-256: 10c760e8a106eb9a3fb4d2574f59939fae687d9edc365510c7490ed8a97d92ab
154 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to Shopify-hosted PDFs, suggesting an attempt to manipulate search engine results or distribute content. One critical heuristic identified a link to a known malicious redirector at 'https://ttraff.ru/pify?keyword=electronics+projects+for+dummies+book+pdf'. The document body, though heavily obfuscated, also contains this URL, indicating it's a primary lure. The ML classifier strongly flagged this PDF as malicious.

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=electronics+projects+for+dummies+book+pdf
    • http://files.tucherrycrusade.com/uploads/1/3/2/6/132681891/6429110.pdf
    • http://files.catchwalleyes.com/uploads/1/3/1/3/131398174/a9d17b1767743.pdf
    • http://files.nosciastudios.com/uploads/1/3/1/0/131070294/9085130.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/8600/2843/files/rigureruwejevet.pdf
    • https://cdn.shopify.com/s/files/1/0429/1274/3591/files/xarakinom.pdf
    • https://cdn.shopify.com/s/files/1/0433/8286/6083/files/50922864647.pdf
    • https://cdn.shopify.com/s/files/1/0432/0467/3699/files/70993564446.pdf
    • https://cdn.shopify.com/s/files/1/0431/1639/6697/files/zebavasupidapudekevuziviz.pdf
    • https://cdn.shopify.com/s/files/1/0429/7388/8671/files/gilaxuvelazonawim.pdf
    • https://cdn.shopify.com/s/files/1/0435/1819/7912/files/rutan.pdf
    • https://cdn.shopify.com/s/files/1/0434/6658/8325/files/sonoxubudosoluzunav.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/78649322563.pdf
    • https://cdn.shopify.com/s/files/1/0431/1770/7425/files/vefiripavelemogevowufu.pdf
    • https://cdn.shopify.com/s/files/1/0427/5906/1670/files/24161536869.pdf
    • https://cdn.shopify.com/s/files/1/0437/1080/8217/files/remor.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_off00005f79.bin
37d5ada176efd13cd6d1d843354697882726d927df321fdd06ce8a3d3766b870
pdf-font-stream PDF embedded font (sfnt) at offset 0x5F79 5328 bytes
font_01_sfnt_off0000718b.bin
2fa17fcef000ea9bb2db67142bbae70a10596866a5e3e413091c8040ea13d7f9
pdf-font-stream PDF embedded font (sfnt) at offset 0x718B 10208 bytes