Malicious PDF — malware analysis report

Static analysis result for SHA-256 740b83509ae658bd…

MALICIOUS

PDF

50.5 KB Created: 2020-08-30 15:51:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c3ae588d44257ed32591afe34ed5d07d SHA-1: 7dbf0a80d4bc6d39ccce20327dcccce3a0768ca3 SHA-256: 740b83509ae658bdc9645246641a71a2c32779ef2637e12bd5927d024d94f879
154 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which, https://ttraff.com/wix?keyword=lenovo+y500+ideapad, is identified as a malicious redirector. The document body, though heavily obfuscated, also contains this URL and other links to Shopify-hosted PDFs, suggesting a link farm or SEO poisoning tactic. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood 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.com/wix?keyword=lenovo+y500+ideapad
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/1557/7504/files/jonizefegubudiv.pdf
    • https://cdn.shopify.com/s/files/1/0432/6411/4843/files/wokagam.pdf
    • https://cdn.shopify.com/s/files/1/0429/4931/2665/files/literature_reader_class_7.pdf
    • https://cdn.shopify.com/s/files/1/0432/2807/0052/files/steel_brothers_saga_book_5_read_online_free.pdf
    • https://cdn.shopify.com/s/files/1/0435/2383/4024/files/17912144816.pdf
    • https://cdn.shopify.com/s/files/1/0435/7790/1214/files/degree_of_a_polynomial_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0450/3057/2190/files/luwomasemibakekadepevava.pdf
    • https://cdn.shopify.com/s/files/1/0431/5044/2652/files/bimejokemugetozujijumas.pdf
    • https://cdn.shopify.com/s/files/1/0428/6706/4998/files/dosedefagazedo.pdf
    • https://cdn.shopify.com/s/files/1/0433/4059/5352/files/47996554566.pdf
    • https://cdn.shopify.com/s/files/1/0430/4538/8442/files/fisakesorejejeviwe.pdf
    • https://cdn.shopify.com/s/files/1/0437/7939/1637/files/rufazenubifono.pdf
    • https://cdn.shopify.com/s/files/1/0437/7713/0658/files/carving_board_turkey_nutrition_information.pdf
    • https://cdn.shopify.com/s/files/1/0431/3110/9538/files/29241870896.pdf
    • https://cdn.shopify.com/s/files/1/0428/2338/5247/files/pelinus.pdf
    • https://cdn.shopify.com/s/files/1/0434/0776/9750/files/50863433830.pdf
    • https://cdn.shopify.com/s/files/1/0432/9511/3374/files/60492665527.pdf
    • https://cdn.shopify.com/s/files/1/0438/0544/2210/files/90898286640.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_off00007c15.bin
a33ee0177895efa7ad21ad52e0a7fca7b9fe389b8c25daea58151bc96ddb2ee3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C15 5016 bytes
font_01_sfnt_off00008d55.bin
466b739ebe3bb0b518736591e28ab4d959d487deb22a7eff7868c8664e1fa4a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D55 15324 bytes

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