Malicious PDF — malware analysis report

Static analysis result for SHA-256 07fe64e7522f3875…

MALICIOUS

PDF

56.3 KB Created: 2020-08-19 21:46:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 66352d5c65adc27f9a9c7367b2ec3e30 SHA-1: 315e492c0719705873d4b8bbc75c0aa295285379 SHA-256: 07fe64e7522f3875c87bbf54985ec5552237eaf6904206159f5978cbf6a98719
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for linking to known malicious redirector infrastructure, specifically pointing to 'ttraff.com'. The document body, though heavily obfuscated, contains a URL that matches this finding. The presence of numerous external PDF links, many hosted on Shopify, suggests an attempt to create a link farm or distribute content, with the primary malicious link being the most concerning.

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=ielts+fever+reading+test+39+answers
    • http://futepafa.spiritofhelder.com/uploads/1/3/0/8/130874038/posudef-nuviwo-povegomuwajako.pdf
    • http://files.thenyancave.com/uploads/1/3/0/7/130739833/5421577.pdf
    • http://files.ethridgedesignstudio.com/uploads/1/3/1/6/131606901/7301492.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/5757/8138/files/421942441.pdf
    • https://cdn.shopify.com/s/files/1/0436/0096/9896/files/bridal_march_vicente_avella.pdf
    • https://cdn.shopify.com/s/files/1/0429/2434/3462/files/73734133314.pdf
    • https://cdn.shopify.com/s/files/1/0434/4496/1436/files/4784188723.pdf
    • https://cdn.shopify.com/s/files/1/0432/4563/3693/files/10th_quarterly_exam_portion_2020.pdf
    • https://cdn.shopify.com/s/files/1/0431/8524/2276/files/11612417886.pdf
    • https://cdn.shopify.com/s/files/1/0429/0392/8991/files/an_introduction_to_biostatistics_thomas_glover.pdf
    • https://cdn.shopify.com/s/files/1/0432/6408/2073/files/46721269979.pdf
    • https://cdn.shopify.com/s/files/1/0434/6226/2936/files/41438395350.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/80084587067.pdf
    • https://cdn.shopify.com/s/files/1/0433/8135/8753/files/gimuradavakigi.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_off00009195.bin
2bbbd1f9a6846b92c8eef4d7529bf6abf1ccdbd2135b11578164b203a506d248		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9195 3104 bytes
font_01_sfnt_off00009cb6.bin
e81de48d654bd91060e6561414fd733024d957dde18f625d0c0cfe74c7450b8c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9CB6 5484 bytes
font_02_sfnt_off0000af7b.bin
88a99a44c37a0d575743a87104820ebea05e98f21b7e8ecbff3e3ca153562d6d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAF7B 10760 bytes

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