Malicious PDF — malware analysis report

Static analysis result for SHA-256 5adb1e1e9f947ce1…

MALICIOUS

PDF

47.5 KB Created: 2020-07-16 03:04:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f5d396b66565243496638630e2fadac3 SHA-1: fe8d31c99b61f246244c284642e3a3f5bb6eb80c SHA-256: 5adb1e1e9f947ce1cdc7b507cc1ca9d81f74a5146811ecfdcd378018eb037aff
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external PDF links, suggesting an attempt to manipulate search engine results or distribute content through a link farm. The ML classifier also 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/wb?keyword=coupling%20alignment%20handbook%20pdf
    • http://files.outwesttechs.com/uploads/1/3/1/0/131070842/dudeta_kakuriri_zosozefupewoz.pdf
    • http://files.aceremovalsbusiness.com/uploads/1/3/0/8/130814308/0c7c5e75274f20.pdf
    • http://files.dorebowen.com/uploads/1/3/1/6/131607174/3994866.pdf
    • http://files.ccmooresville.com/uploads/1/3/1/3/131381819/tanupip.pdf
    • http://fontawesome.iohttp://fontawesome.io/license/
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://sediniguto.files.wordpress.com/2020/06/59223435775.pdf
    • https://jiwuvef.files.wordpress.com/2020/06/sifevipoloki.pdf
    • https://solasuz.files.wordpress.com/2020/07/9672657131.pdf
    • https://zidimamokad339045790.files.wordpress.com/2020/06/98534984404.pdf
    • https://mivokalu.files.wordpress.com/2020/06/visudapitapapefugavop.pdf
    • https://dumutifojut.files.wordpress.com/2020/06/tokeri.pdf
    • https://juzifak.files.wordpress.com/2020/06/46965584473.pdf
    • https://linujidiru785249151.files.wordpress.com/2020/06/64183176780.pdf
    • https://cdn.shopify.com/s/files/1/0429/4865/7318/files/tesorowirufanaf.pdf
    • https://cdn.shopify.com/s/files/1/0427/7898/4614/files/digenexagewa.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/78046530146.pdf
    • https://cdn.shopify.com/s/files/1/0432/7292/9435/files/35797259703.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/23651487672.pdf
    • https://cdn.shopify.com/s/files/1/0430/0718/0954/files/pejabab.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000738e.bin
0727529401fe802ed9d02ac4b3bed84f53da9d0a5838f1dab7fe2f7579417e88		 pdf-font-stream PDF embedded font (sfnt) at offset 0x738E 1696 bytes
font_01_sfnt_off00007bb8.bin
acba2f779b719b30f2b99521531300cd3e244be2925eb0d60399f33eaf6dcf0c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7BB8 5288 bytes
font_02_sfnt_off00008d8f.bin
19b0ca78853ef671bcc5311928b28f543c950cc0e0578d716bf68ac28cdc1dfe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D8F 10264 bytes

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