Malicious PDF — malware analysis report

Static analysis result for SHA-256 26cfb459204498ea…

MALICIOUS

PDF

53.0 KB Created: 2020-07-13 20:29:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2301e6b043958eab9467f95f4153c466 SHA-1: b4cc836e7d31d66df98b6d5ee2e270fa72c19116 SHA-256: 26cfb459204498eab7ebbe9bafc0d2d6b220a2ac827e90e06de53fb29dde89a1
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to known malicious redirectors or link farms designed to host further malicious content. The primary redirector URL is https://ttraff.ru/wb?keyword=snapshots%20of%20a%20daughter%20in%20law%20pdf. This indicates a phishing or content-luring attack pattern. No scripts were extracted, and the document body was heavily obfuscated.

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=snapshots%20of%20a%20daughter%20in%20law%20pdf
    • http://files.stgilespreschool.org/uploads/1/3/1/6/131637081/9ece6.pdf
    • http://files.thurlingguitars.com/uploads/1/3/0/8/130874063/3514529.pdf
    • http://files.southwoden.com/uploads/1/3/1/4/131407823/magapaz_koviridamuz.pdf
    • http://files.en.agiteysirva.com/uploads/1/3/1/1/131164039/8803c0056a15b42.pdf
    • http://files.ingeermusic.com/uploads/1/3/2/6/132681740/zigenezixi-kupofezenogejal.pdf
    • http://files.cedarcrestcc.com/uploads/1/3/1/3/131380236/6fac3cc5d.pdf
    • http://files.iwfmichigan.org/uploads/1/3/1/1/131164007/jovimeruwova-lirux.pdf
    • http://files.vk3sn.net/uploads/1/3/1/8/131871894/d40f274a4b81b4.pdf
    • http://files.esdaw.eu/uploads/1/3/1/3/131378779/9735723.pdf
    • http://files.unionvibeent.com/uploads/1/3/2/7/132712614/vuregefadeviridumu.pdf
    • http://files.vk3sn.net/uploads/1/3/1/8/1318718
    • https://ronoretexupo.files.wordpress.com/2020/06/vupimufipabenorijomoxuxu.pdf
    • https://pigijobegoj.files.wordpress.com/2020/07/xumivakimabit.pdf
    • https://nedudiwu.files.wordpress.com/2020/06/besujif.pdf
    • https://cdn.shopify.com/s/files/1/0432/1483/1780/files/pazuzulelekovavedafo.pdf
    • https://cdn.shopify.com/s/files/1/0429/6769/5509/files/zonijojoduku.pdf
    • https://cdn.shopify.com/s/files/1/0432/1204/6491/files/kilupusuvat.pdf
    • https://cdn.shopify.com/s/files/1/0431/4356/1384/files/lebagut.pdf
    • https://cdn.shopify.com/s/files/1/0430/5502/2234/files/guvowoxuwomafazuloki.pdf
    • https://cdn.shopify.com/s/files/1/0433/0445/2246/files/91201844961.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_off000092a1.bin
dde35df28b0e14564a2cf1e0ace13d20c8f13c3f2413f1a97e680d8f5ff6bd90		 pdf-font-stream PDF embedded font (sfnt) at offset 0x92A1 5380 bytes
font_01_sfnt_off0000a4e6.bin
a162031032f39b1310bdc65b76675ddf05cfb05f677718c4a4a1dda9be36b0a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA4E6 9860 bytes

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