Malicious PDF — malware analysis report

Static analysis result for SHA-256 13779be0ac9ceb30…

MALICIOUS

PDF

49.2 KB Created: 2020-07-27 21:06:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 86f1be28790442c123740e0dc841b4df SHA-1: a203f7244c9e1eeb6a4e8988638d53eecb71f4b4 SHA-256: 13779be0ac9ceb3016c7e5e0abd2cde444d39a45061f33c1e24fa8fb44525ac8
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.ru, which is likely used to funnel victims to further malicious content or downloads. The document body, though heavily obfuscated, suggests a lure related to 'Conversions worksheet 5th grade'. The presence of numerous external PDF links, many hosted on Shopify, indicates a link farm strategy, potentially for SEO poisoning or distributing malware. The ML classifier strongly flagged this PDF as malicious.

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=conversions+worksheet+5th+grade
    • http://files.msmagnosjcs.com/uploads/1/3/0/7/130775306/4178081.pdf
    • http://files.rebatensemble.org/uploads/1/3/1/4/131453253/nafexamuj.pdf
    • http://files.summasportswear.com/uploads/1/3/0/8/130873708/mugawetagiruta_kezid_mufok_sutula.pdf
    • http://files.wildviewofficial.com/uploads/1/3/1/3/131398504/4998004.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/2841/4618/files/fuzedejifisesuvufoma.pdf
    • https://cdn.shopify.com/s/files/1/0429/8113/0394/files/velezasaza.pdf
    • https://cdn.shopify.com/s/files/1/0430/0495/2735/files/21030979657.pdf
    • https://cdn.shopify.com/s/files/1/0433/1218/5494/files/62821200222.pdf
    • https://cdn.shopify.com/s/files/1/0428/8148/2919/files/sepenuzizoso.pdf
    • https://cdn.shopify.com/s/files/1/0430/3850/7169/files/95227401388.pdf
    • https://cdn.shopify.com/s/files/1/0431/4451/1645/files/rukamid.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/todexarim.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/sutapazuvonovojikujabera.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/fuwemosuwizukuxitakalav.pdf
    • https://cdn.shopify.com/s/files/1/0427/7361/0663/files/dalagopami.pdf
    • https://cdn.shopify.com/s/files/1/0431/3173/2132/files/jobakamuxewurofoledeju.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_off000081e2.bin
49241a3b559f0ca92254ad7bd144c612d1d6e1d47bb18964677d7e144dadfc41		 pdf-font-stream PDF embedded font (sfnt) at offset 0x81E2 5208 bytes
font_01_sfnt_off000093a6.bin
bd905f4e8a284ef8d7103254896197de750a0a304c4f8833404b6ce4766073dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x93A6 10352 bytes

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