Malicious PDF — malware analysis report

Static analysis result for SHA-256 671558a1abbe64d6…

MALICIOUS

PDF

39.7 KB Created: 2020-08-20 11:48:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9ebf6fe8950b4899bf0d05f50bc80337 SHA-1: fc2d73c5390ec3a6ed4b896fab3e415dfd7c52d3 SHA-256: 671558a1abbe64d6a9aaa55cc7490f58ebd6133c446ba8f005125b7482284fee
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to redirector infrastructure designed to obscure the final malicious destination. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' confirms that at least one URL leads to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that appears to be part of this link farm, suggesting an attempt to manipulate search engine results or lure users with seemingly benign content. No scripts were extracted, but the sheer volume of malicious links indicates a phishing or scam attempt.

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.com/pify?keyword=vector+banner+background+design+free
    • http://judojaz.nicole-phillips.com/uploads/1/3/1/4/131437626/d79fcdf54f.pdf
    • http://gaxiwika.kpepiscopal.org/uploads/1/3/0/7/130775734/datiwikujidazoxinex.pdf
    • http://jekugad.inescapableclothing.com/uploads/1/3/1/4/131454029/zuwonigijipi-guzejol-xowopolunom-rasolaguf.pdf
    • http://bupaletu.ivywigmore.net/uploads/1/3/1/0/131070420/kugowumeje-figupa-xoxazipub-mifofuzulame.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0432/6244/3675/files/corazon_espinado_chords.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/6384338271.pdf
    • https://cdn.shopify.com/s/files/1/0437/5045/7505/files/xivuvinori.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xuxovozukirofavekejob.pdf
    • https://cdn.shopify.com/s/files/1/0438/9535/7595/files/butchery_business_plan_south_africa.pdf
    • https://cdn.shopify.com/s/files/1/0437/0006/0310/files/famekozuvo.pdf
    • https://cdn.shopify.com/s/files/1/0431/9503/9905/files/zosekiduniwoninisolafu.pdf
    • https://cdn.shopify.com/s/files/1/0439/2402/9608/files/4746061689.pdf
    • https://cdn.shopify.com/s/files/1/0448/5254/3649/files/the_real_book_c.pdf
    • https://cdn.shopify.com/s/files/1/0431/9933/2516/files/26032451994.pdf
    • https://cdn.shopify.com/s/files/1/0427/9376/2975/files/befapidopesuvixavu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xomuburisuxenogiduta.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_off00004d02.bin
c24a0eb287587d6ca6dded9eacc3b865431cd9ecf81624cbaa0101243f2c941a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4D02 5208 bytes
font_01_sfnt_off00005ec0.bin
6dac7452eb789d9d7d027223453d0575f8ce1da056ca1baf835039c93641107e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5EC0 11612 bytes
font_02_sfnt_off000083af.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x83AF 4324 bytes

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