Malicious PDF — malware analysis report

Static analysis result for SHA-256 043dd807f0fa3535…

MALICIOUS

PDF

45.8 KB Created: 2020-08-08 02:05:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 492d2c4be318a4906271d8f736428268 SHA-1: a62642c0ee9c64523a9ac26ef5ae595be146820b SHA-256: 043dd807f0fa35350825f50150912f75058cae680f515f950316a85309c421a2
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of embedded links, many of which point to a redirector service (ttraff.ru) known for malicious activity. The document body and embedded links suggest a tactic to create a link farm, potentially for SEO manipulation or to distribute further malicious content. The ML classifier also strongly indicated maliciousness.

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=blink+xt2+manual+pdf
    • http://files.claradecapua.com/uploads/1/3/1/8/131858592/sogakolazazap.pdf
    • http://files.hendersonbagelcompany.com/uploads/1/3/0/9/130969192/zubemozubaku-xomab.pdf
    • http://files.jjsdka.org/uploads/1/3/0/9/130969819/98a098cf.pdf
    • http://vewigatof.quitosltd.com/uploads/1/3/0/8/130814297/zizinuga_zupofubagi_nagodajipevasag.pdf
    • http://files.berksartalliance.com/uploads/1/3/1/3/131383602/fcf355f334004.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0435/0767/9387/files/18456096399.pdf
    • https://cdn.shopify.com/s/files/1/0434/8339/8310/files/carcassonne_rules.pdf
    • https://cdn.shopify.com/s/files/1/0427/6980/9575/files/94539773550.pdf
    • https://cdn.shopify.com/s/files/1/0428/9275/5111/files/dixalakagagevaj.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/78394199391.pdf
    • https://cdn.shopify.com/s/files/1/0427/9602/3975/files/93253560772.pdf
    • https://cdn.shopify.com/s/files/1/0434/9168/8610/files/subumopijoza.pdf
    • https://cdn.shopify.com/s/files/1/0428/8082/7558/files/28754375810.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/62114329075.pdf
    • https://cdn.shopify.com/s/files/1/0432/5300/6494/files/doxuxagekujuso.pdf
    • https://cdn.shopify.com/s/files/1/0433/2634/1272/files/43880546573.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_off00006a0b.bin
0b463b43f044fc8e0753fea289215ee6945083d48c67d3b8e4e771d11f6427d9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A0B 4880 bytes
font_01_sfnt_off00007a80.bin
44071ffdaf485b68320417868aee5ac5971122bd7476aef095cc80b5163d2d16		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A80 9884 bytes
font_02_sfnt_off00009c4d.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9C4D 4324 bytes

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