Malicious PDF — malware analysis report

Static analysis result for SHA-256 024a23809c794c59…

MALICIOUS

PDF

34.7 KB Created: 2020-09-05 22:17:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 70ca4344767b83a9c151f640d6d06d4f SHA-1: 4add0aed7bbfda8509e44defa73e2f51cbad4a2f SHA-256: 024a23809c794c597832a8f77f48ddbc3b3d3c9a2d8ff20f4ba23efae9d814d2
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link that redirects to malicious infrastructure, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. Additionally, it hosts a large number of external PDF links, suggesting a link farm for SEO manipulation or traffic redirection. The ML classifier also strongly flagged this PDF as malicious. The primary IOC is the redirector URL.

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.club/wix?keyword=harwin+gecko+datasheet
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/8681/4109/files/96025550047.pdf
    • https://cdn.shopify.com/s/files/1/0428/4815/7859/files/bivokoguxedoxafarugaxojo.pdf
    • https://cdn.shopify.com/s/files/1/0432/2839/7727/files/26735660951.pdf
    • https://cdn.shopify.com/s/files/1/0437/4839/3112/files/discord_overlay_not_working_wow.pdf
    • https://cdn.shopify.com/s/files/1/0434/5259/6374/files/favegesixadavolomi.pdf
    • https://cdn.shopify.com/s/files/1/0432/5670/9288/files/5650182034.pdf
    • https://cdn.shopify.com/s/files/1/0434/3175/5932/files/jaxozogusuvaxinuk.pdf
    • https://cdn.shopify.com/s/files/1/0432/3275/5875/files/systems_engineering_and_analysis_5th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0433/3030/6203/files/xatojetisajoserotafeliwag.pdf
    • https://cdn.shopify.com/s/files/1/0432/5313/7563/files/expanded_notation_worksheets_free.pdf
    • https://cdn.shopify.com/s/files/1/0435/1531/4330/files/fufobogupo.pdf
    • https://cdn.shopify.com/s/files/1/0427/5165/6102/files/defedurajote.pdf
    • https://cdn.shopify.com/s/files/1/0430/6495/0945/files/jenavezipumaxag.pdf
    • https://cdn.shopify.com/s/files/1/0437/2067/1384/files/bhagavad_gita_slokas_in_telugu_with_meaning_in_english.pdf
    • https://static.usrfiles.com/ugd/b8c837_7512fdf9bc5245d49cfd1570251fa20f.pdf
    • https://static.usrfiles.com/ugd/b8c837_d31096489efc48f1ae5892255feb8075.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_off00004aab.bin
88ec0dec9047ec33d335b79c4c419e92e5b18fcebea1fcb667e740701d7c41b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4AAB 5284 bytes
font_01_sfnt_off00005cad.bin
dea27411da710da147217b7f7407d5bf2c38b22a55ee713c6d3280de04f40e27		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5CAD 9744 bytes

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