Malicious PDF — malware analysis report

Static analysis result for SHA-256 12032f7566e4133d…

MALICIOUS

PDF

64.8 KB Created: 2020-08-12 22:31:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dce69ab3edd41ae2c0889cf0fb9c8523 SHA-1: fa1e3e5010a6e9fd1217f0525d6e229037099013 SHA-256: 12032f7566e4133d57da056aba9cec98154d47d9d1001b386ad74b59c4ab105b
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.ru, which is disguised as a link to workout PDFs. The document body, though heavily obfuscated, contains the same URL and keywords related to 'kettlebell workouts pdf'. The ML classifier strongly indicates maliciousness, and the PDF structure suggests a link farm designed to drive traffic to malicious sites.

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.ru/wb?keyword=125%20kettlebell%20workouts%20pdf
    • http://files.coaching-planet.com/uploads/1/3/2/8/132814276/lebumujajofo-dewitupekaja-mozofaw.pdf
    • http://files.aceearlyyears.com/uploads/1/3/0/7/130738534/3150941.pdf
    • http://files.dragonflykarate.org/uploads/1/3/0/7/130739614/4790490.pdf
    • http://files.sfhsperformingarts.com/uploads/1/3/0/7/130776499/negugulebum.pdf
    • http://nanaz.alexeyevasmith.com/uploads/1/3/0/7/130775626/d23358f69b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/9462/0837/files/walulixifavigowod.pdf
    • https://cdn.shopify.com/s/files/1/0428/6165/8279/files/guvonuwurojunego.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/wupukibasabozuxijixosi.pdf
    • https://cdn.shopify.com/s/files/1/0439/2452/1128/files/19556922557.pdf
    • https://cdn.shopify.com/s/files/1/0434/2641/4749/files/32160577199.pdf
    • https://cdn.shopify.com/s/files/1/0437/1100/4821/files/jerufejixovuwoz.pdf
    • https://cdn.shopify.com/s/files/1/0430/4519/1841/files/alter_ego_plus_a2_corriges.pdf
    • https://cdn.shopify.com/s/files/1/0431/5702/9019/files/24901482887.pdf
    • https://cdn.shopify.com/s/files/1/0440/5238/1846/files/zebosuzevasizo.pdf
    • https://cdn.shopify.com/s/files/1/0427/5588/3175/files/mugopekavutubobanitezow.pdf
    • https://cdn.shopify.com/s/files/1/0431/7213/5074/files/mapekutugusuna.pdf
    • https://cdn.shopify.com/s/files/1/0427/4647/8759/files/86953505774.pdf
    • https://cdn.shopify.com/s/files/1/0433/4790/2622/files/3267814168.pdf
    • https://cdn.shopify.com/s/files/1/0433/6363/1272/files/52601767745.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_off0000b447.bin
a2e12960a4c8991e742ffefef8ea1fc0ffdb50cabb6915e705f88ab324280f58		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB447 5332 bytes
font_01_sfnt_off0000c689.bin
daad3f347a4f42f432ee9983e619a7c063e36761dba5934b469418034847e28e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC689 1800 bytes
font_02_sfnt_off0000cf17.bin
9ebad58e7c14e2d1cff361a9a99ca7a8932473143ccffb0e510e5b5bcf01e615		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF17 11636 bytes

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