Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e8b6885c35c23f7…

MALICIOUS

PDF

64.4 KB Created: 2020-08-28 22:41:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f90baedadcd1c397cb40e6e00ccf8735 SHA-1: acf85171ac5a8e0faf3c124ca999c50667a1e06a SHA-256: 6e8b6885c35c23f748d8f80f024fa11d7f7503c195efe05bc8b2f2b9193a4ed1
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK, indicating it points to a known malicious URL. Additionally, PDF_SEO_LINK_FARM suggests the document is part of a link farm, with numerous embedded links. The primary malicious URL identified is https://ttraff.cc/wix?keyword=propiedades+quimicas+de+los+materiales+oxidacion+y+corrosion, which is likely used to redirect users to a malicious site or download further payloads.

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/wix?keyword=propiedades+quimicas+de+los+materiales+oxidacion+y+corrosion
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0432/0113/4747/files/civilization_revolution_2_achievement_guide.pdf
    • https://cdn.shopify.com/s/files/1/0429/1756/0473/files/21422979405.pdf
    • https://cdn.shopify.com/s/files/1/0440/6706/1910/files/26487317702.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/62114329075.pdf
    • https://cdn.shopify.com/s/files/1/0437/6051/7269/files/arkansas_zip_code_map.pdf
    • https://cdn.shopify.com/s/files/1/0436/3298/4222/files/bandura_s_self_efficacy_theory.pdf
    • https://cdn.shopify.com/s/files/1/0437/7011/8306/files/glencoe_geometry_word_problem_practice_answer_key.pdf
    • https://cdn.shopify.com/s/files/1/0431/5293/3021/files/nuworigavafabukegi.pdf
    • https://cdn.shopify.com/s/files/1/0432/4379/8683/files/characteristics_of_ethnographic_research.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/49221060197.pdf
    • https://cdn.shopify.com/s/files/1/0428/5287/6455/files/3344170007.pdf
    • https://cdn.shopify.com/s/files/1/0432/3190/3902/files/73506205218.pdf
    • https://cdn.shopify.com/s/files/1/0431/6132/1634/files/vagezifatupinubekikedi.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_off0000aea7.bin
92911dcc81cd161c1c1746300d93fca884dab04f9bbcdaa9d2ee3f07a0bf6016		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAEA7 5400 bytes
font_01_sfnt_off0000c0ed.bin
516491d83f6c8a10177a92460e912bf92f1e532a31bc73a781a9201af822e573		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC0ED 10860 bytes
font_02_sfnt_off0000e422.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE422 4324 bytes

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