Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f592f9e9c8c6635…

MALICIOUS

PDF

45.5 KB Created: 2020-08-08 08:49:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a85bf596ae7ad71a0e8f4eb0613b58d8 SHA-1: 3ebd5c2fda96a7fd34ac444f1c229eb2bc9079ec SHA-256: 0f592f9e9c8c6635ef7578cd948515824ba0fae82c14116e5c37909eabab9882
154 Risk Score

Malware Insights

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

This PDF document contains numerous links, many pointing to external PDF files, suggesting a link farm or redirection tactic. One critical heuristic identified a link to known malicious redirector infrastructure, specifically `https://ttraff.cc/pify?keyword=bsc+maths+book+pdf`. The document body, though heavily obfuscated, also contains this URL, indicating an attempt to disguise malicious links as legitimate content. The presence of embedded URLs and the ML classifier's high confidence score support the assessment of malicious intent.

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.cc/pify?keyword=bsc+maths+book+pdf
    • http://jososuxeb.wvangler.com/uploads/1/3/1/0/131071157/kaxanorepukatupu.pdf
    • http://files.londonderryhomeowners.com/uploads/1/3/0/7/130776646/benitavajimusu-kedivopijusura-mutigixozatiwov-naxepigepobapoz.pdf
    • http://files.holytrinitywytheville.org/uploads/1/3/0/7/130740563/wuliva_woboxefine_zenetudidawoti.pdf
    • http://files.theskinandlashlady.com/uploads/1/3/1/4/131455722/mobazasivibufo.pdf
    • http://nojipip.altoreformedchurch.org/uploads/1/3/1/4/131407089/zovutenurelesiva.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/poxusulijupidokubeb.pdf
    • https://cdn.shopify.com/s/files/1/0431/8851/9080/files/xopolodubimowigebo.pdf
    • https://cdn.shopify.com/s/files/1/0435/6793/9743/files/sufowiresuzegu.pdf
    • https://cdn.shopify.com/s/files/1/0432/2656/2722/files/pedizomuxolejuwamalade.pdf
    • https://cdn.shopify.com/s/files/1/0435/5715/9063/files/65738675197.pdf
    • https://cdn.shopify.com/s/files/1/0434/7713/9613/files/carson_mccullers_the_ballad_of_the_sad_cafe.pdf
    • https://cdn.shopify.com/s/files/1/0439/0636/7656/files/51862032123.pdf
    • https://cdn.shopify.com/s/files/1/0435/1338/1028/files/xafepafixufig.pdf
    • https://cdn.shopify.com/s/files/1/0433/2571/8678/files/44344118395.pdf
    • https://cdn.shopify.com/s/files/1/0437/4003/7271/files/resiromojazesenefipunusa.pdf
    • https://cdn.shopify.com/s/files/1/0429/9948/0473/files/zomazavamewavaf.pdf
    • https://cdn.shopify.com/s/files/1/0433/2892/9945/files/bovejofivoxafilu.pdf
    • https://cdn.shopify.com/s/files/1/0428/0962/2687/files/fuwubizu.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_off00006de0.bin
4fbbb10d5c6460261c3ecca47e8d334af61a156df6149e7b5013e2343894ffd9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DE0 5520 bytes
font_01_sfnt_off0000807f.bin
1dc0655f1ad06d2ec34e149752d42348242749f3c9f4b29c7c8109e7a78c40c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x807F 12660 bytes

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