Malicious PDF — malware analysis report

Static analysis result for SHA-256 843001980aec375f…

MALICIOUS

PDF

40.9 KB Created: 2020-10-31 03:07:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: bb0ce951b066c23eec8fd3cb1066d902 SHA-1: e8f35e068dbfa5566a82c685dd94a4bb9899b96c SHA-256: 843001980aec375fa701e01db60d8ba2211efececa34cf69fbe0b96545782544
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains references to 'web mastering pdf' and includes the malicious URL, suggesting a lure to phishing or malware distribution sites. The ML classifier also strongly indicated maliciousness.

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://ggtraff.ru/wb?keyword=web%20mastering%20pdf In PDF document text
    • https://sakuvida.weebly.com/uploads/1/3/0/7/130775714/vudomixe-wodumefuzas-fatojevegapul.pdfIn PDF document text
    • https://taxufizewafodo.weebly.com/uploads/1/3/4/4/134477277/jakopunu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385631/normal_5f97123c08997.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392193/normal_5f976fbfc68b8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413867/normal_5f9734d16d2b6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388293/normal_5f961de39ed85.pdfIn PDF document text
    • https://jufaxexave.weebly.com/uploads/1/3/0/7/130775513/2b4c72c198680.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368479/normal_5f939da7ed697.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/5843/6513/files/the_night_watchman.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/5183/5811/files/bro_code_barney_stinson_espaol.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/6954/5887/files/19750851459.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/7757/3043/files/death_counter_minecraft_server.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0506/5598/5814/files/21050887178.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0268/8545/6062/files/xubewowuzobofuxu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/0607/3759/files/zufijigorizuw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/8827/1767/files/54951787287.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005fa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FA8 5480 bytes
SHA-256: f1393d344558921377885ada99d513d0b0c0f06417492e7ffc36e1430a995f0e
font_01_sfnt_off0000723c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x723C 10780 bytes
SHA-256: 94140f98fdda5a07b0488a0e24f26630cfb89281e0cb7f29ebc48c75eb556c45

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