Malicious PDF — malware analysis report

Static analysis result for SHA-256 364c7a8b33687315…

MALICIOUS

PDF

53.8 KB Created: 2020-11-01 19:40:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c8c3fff3932dbb7249386f933b334895 SHA-1: 7ebe94d1189aefdc70c86739a2bbe96e6dc2d45f SHA-256: 364c7a8b336873153096090dede1cbaec19dd0556792fb22628ee917ec0c55a0
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to Shopify domains with seemingly benign filenames, but one critical link directs to a known malicious redirector. The ML classifier also flagged this PDF as malicious. The presence of a malicious redirector suggests an attempt to lead the user to a phishing or malware distribution site, disguised as legitimate 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://ggtraff.ru/strik?keyword=chemical+nomenclature+worksheet+answers
    • https://wisizexabebaj.weebly.com/uploads/1/3/4/4/134461468/5553962.pdf
    • https://cdn-cms.f-static.net/uploads/4376856/normal_5f9cf8c64c7a2.pdf
    • https://cdn-cms.f-static.net/uploads/4373016/normal_5f8ea3d2748a1.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0504/9178/5378/files/letter_g_tracing_worksheets_for_preschool.pdf
    • https://cdn.shopify.com/s/files/1/0501/9998/6358/files/imf_report_on_ghana_2020.pdf
    • https://cdn.shopify.com/s/files/1/0482/6572/4059/files/13382636185.pdf
    • https://cdn.shopify.com/s/files/1/0498/7741/8173/files/ford_escape_2020_repair_manual.pdf
    • https://cdn.shopify.com/s/files/1/0483/3735/4903/files/los_mango_engordan.pdf
    • https://cdn.shopify.com/s/files/1/0431/1390/6327/files/good_food_guide_cake_recipes.pdf
    • https://cdn.shopify.com/s/files/1/0436/1574/8253/files/naxuxabik.pdf
    • https://cdn.shopify.com/s/files/1/0485/0607/7339/files/how_to_multiply_and_divide_rational_expressions_step_by_step.pdf
    • https://cdn.shopify.com/s/files/1/0502/6398/2233/files/fidoridurawopokepagigada.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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License
    • http://scripts.sil.org/OFL

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00008d1a.bin
c6c139fb2e663423231f2a75893cbb5ab284aacc608654a04b214cead46644c3		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x8D1A 26492 bytes
font_00_sfnt_off0000594f.bin
da42fa9893e343daed23178e8892e9ad6d6f3180f8b34b201a26160aa9441d13		 pdf-font-stream PDF embedded font (sfnt) at offset 0x594F 5100 bytes
font_01_sfnt_off00006a8b.bin
06b8ead04f1dab8a5c6d86f9fead76ade6f71a64e05fef1613fc25e0535c4ed7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A8B 10140 bytes
font_03_sfnt_off0000b9d6.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB9D6 4324 bytes

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