Malicious PDF — malware analysis report

Static analysis result for SHA-256 de8c30239723d409…

MALICIOUS

PDF

47.7 KB Created: 2020-08-12 00:52:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: db06bc4f8f2f254efa2fdc60733d9d31 SHA-1: 7ed6c63b0f5d65bef43bfd44558f6574ff16ff01 SHA-256: de8c30239723d409b72c86393cfa5da6c3617c9e28dc4f7d57320a628ccac947
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of embedded links, with one specifically pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains references to the malicious URL and several benign-looking URLs hosted on Shopify, likely part of a link farm to obscure the malicious destination. The primary attack pattern involves redirecting users to malicious infrastructure.

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.cc/wb?keyword=oxigeno%20disuelto%20en%20agua%20pdf
    • http://bagera.algodonesdentistry.com/uploads/1/3/1/0/131070036/b33d6a1e.pdf
    • http://files.ggiovane.com/uploads/1/3/1/8/131871849/4c93f58c374d5.pdf
    • http://gitad.silas-house.com/uploads/1/3/0/9/130968917/kovuz-gumip-dusemu-tigogafezi.pdf
    • http://files.heartbrake2breakthrough.com/uploads/1/3/1/4/131455543/8444828.pdf
    • http://files.alden-moore.com/uploads/1/3/0/9/130969656/neputipedo-lejakasevi.pdf
    • https://cdn.shopify.com/s/files/1/0430/7307/7409/files/gogutukotufegedofizujit.pdf
    • https://cdn.shopify.com/s/files/1/0432/1021/1491/files/arcane_warrior_dragon_age_origins.pdf
    • https://cdn.shopify.com/s/files/1/0430/5502/2234/files/53864013959.pdf
    • https://cdn.shopify.com/s/files/1/0431/2186/8960/files/vidifesasijotawukiwisak.pdf
    • https://cdn.shopify.com/s/files/1/0433/7935/9900/files/social_impact_assessment_process.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/taniseraguvifololesugom.pdf
    • https://cdn.shopify.com/s/files/1/0435/9431/7981/files/astrology_a_guide_to_understanding_your_birth_chart.pdf
    • https://cdn.shopify.com/s/files/1/0433/3027/3448/files/ramepijegomifar.pdf
    • https://cdn.shopify.com/s/files/1/0427/7954/1671/files/jesurudoxopimakikutenu.pdf
    • https://cdn.shopify.com/s/files/1/0430/2703/8369/files/67481286459.pdf
    • https://cdn.shopify.com/s/files/1/0431/4903/3640/files/cursos_de_ingles_basico_gratis.pdf
    • https://cdn.shopify.com/s/files/1/0431/9094/3904/files/73891342013.pdf
    • https://cdn.shopify.com/s/files/1/0436/3019/8937/files/16051879040.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/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000065eb.bin
6ecf140e8ad63849f92d4c12989621a8ab019886d2cc59c3055432a60f901d66		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65EB 5208 bytes
font_01_sfnt_off000077c3.bin
03f1cea6d3c0ae9ea12fb16de3c4c662bfd6b74f3f54a8d914d8976f15b03923		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77C3 10492 bytes
font_02_sfnt_off00009a3c.bin
52699c0486b682794125e5175475e2ca574641a38a933a38dd21a03779b14908		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9A3C 16232 bytes

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