Malicious PDF — malware analysis report

Static analysis result for SHA-256 64c137d6bf165796…

MALICIOUS

PDF

41.0 KB Created: 2020-08-31 13:54:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 914a4a3f920985d13259e375daf7f03f SHA-1: 68c9cf54f38c9baacb25922179c0c60c477f963e SHA-256: 64c137d6bf16579665d65c6e0a217e0c38e60bc0b3257bd7503ccf737d03844e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by an ML classifier and contains a link to a known malicious redirector. The heuristic PDF_SEO_LINK_FARM indicates the document is part of a link farm, likely for SEO manipulation, and points to numerous other PDFs. The embedded URL likely serves as a lure to redirect the user 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.ru/wix?keyword=autotransformer+starter+dol+starter+diagram
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/eb4c03_9b545f58c5e54b6bbcbe8f05889e3008.pdf
    • https://static.usrfiles.com/ugd/db93e9_d703e1682f0749df8024f172e57c0b2b.pdf
    • https://static.usrfiles.com/ugd/3fc21f_cd3ea7b607c64a4ea4bf611de0ff92a0.pdf
    • https://cdn.shopify.com/s/files/1/0437/2971/5354/files/28819105810.pdf
    • https://cdn.shopify.com/s/files/1/0436/1102/9667/files/linguistic_typology_morphology_and_syntax.pdf
    • https://cdn.shopify.com/s/files/1/0433/7857/3464/files/25623803439.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nitopufekuriwuk.pdf
    • https://cdn.shopify.com/s/files/1/0433/3545/0774/files/xukidofutarakopetiru.pdf
    • https://cdn.shopify.com/s/files/1/0434/5279/2982/files/minecraft_animation_maker_online_no.pdf
    • https://cdn.shopify.com/s/files/1/0429/8620/9439/files/wesemolama.pdf
    • https://cdn.shopify.com/s/files/1/0434/7854/8630/files/company_of_heroes_2_guide.pdf
    • https://cdn.shopify.com/s/files/1/0433/8565/1358/files/wemabivogenexiredal.pdf
    • https://cdn.shopify.com/s/files/1/0435/7488/6563/files/nurutaxulekuturalibul.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006329.bin
866d319956d2f9ece8a424fe2285cd673b75b546a397e1456f46f95216ca2b2d
pdf-font-stream PDF embedded font (sfnt) at offset 0x6329 5216 bytes
font_01_sfnt_off000074d0.bin
7ea12e9478a755a974f4210d94103f2e5b9c1f96a49ec246d68e3bf28a90e946
pdf-font-stream PDF embedded font (sfnt) at offset 0x74D0 10012 bytes