Malicious PDF — malware analysis report

Static analysis result for SHA-256 66591cca551de437…

MALICIOUS

PDF

45.3 KB Created: 2020-08-29 21:55:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bafb60ded4c24c679e848647bede37cb SHA-1: 9b5e0baaeaec2538512fa190ae90907a0cf628b0 SHA-256: 66591cca551de437057ecdb4d9fcfff02135c8a4a6cb9a9bb827472e19fc7a99
154 Risk Score

Malware Insights

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

The PDF document contains embedded links, one of which points to a known malicious redirector infrastructure at `https://ttraff.ru/wix?keyword=autocad+2020+serial+number+generator`. The document body, though heavily obfuscated, appears to contain text related to software serial numbers, suggesting a lure to trick users into clicking the malicious link. The presence of numerous other PDF links, many hosted on Shopify, indicates a potential SEO link farm strategy to distribute malicious content.

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/wix?keyword=autocad+2020+serial+number+generator
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0461/7256/9753/files/telugu_kathalu_books_free.pdf
    • https://cdn.shopify.com/s/files/1/0433/9079/5941/files/64678047848.pdf
    • https://cdn.shopify.com/s/files/1/0428/9026/4742/files/19000000351.pdf
    • https://cdn.shopify.com/s/files/1/0440/5798/5189/files/epic_seven_guider_aither_build.pdf
    • https://static.usrfiles.com/ugd/b8c837_58cb417fc5a44158927dfaadcf54042e.pdf
    • https://static.usrfiles.com/ugd/b8c837_7c38f64e06c6438f9b7e65ccef2aafa4.pdf
    • https://static.usrfiles.com/ugd/b7082a_cb05d81490224eaebd764b8c02a6183c.pdf
    • https://cdn.shopify.com/s/files/1/0431/4995/1138/files/elementos_de_la_administracion_publica_en_guatemala.pdf
    • https://cdn.shopify.com/s/files/1/0439/7475/4462/files/english_story_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0440/7197/7110/files/molapefuxozuno.pdf
    • https://cdn.shopify.com/s/files/1/0430/8841/2836/files/48721063286.pdf
    • https://cdn.shopify.com/s/files/1/0433/6985/7176/files/13303600206.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_off00005979.bin
8b46c22ac4f2a9a1182f09eda697a87317aa0b5c1035946e46497908196f4da4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5979 5544 bytes
font_01_sfnt_off00006c27.bin
4d8768c8fdb183c065d2d66db0e1d339ec6861f68eba3f878b885b9c7d66d383		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C27 14480 bytes
font_02_sfnt_off00009883.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9883 4324 bytes

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