Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa3726d0ae41161a…

MALICIOUS

PDF

52.7 KB Created: 2020-08-31 16:26:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 707b4dfd55327cc19ac94fab8f3eb342 SHA-1: cddd0ed8cf01198cf8799f4e04747bfbb3644c46 SHA-256: fa3726d0ae41161a1a34f2c8c1f373b48bee965f0d0b4fa73546ae7622362b39
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.me, disguised as a fishing report. The document body, though heavily obfuscated, contains this URL and references to other PDF files, suggesting a link farm or redirection tactic. The ML classifier also strongly indicated maliciousness.

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.me/wix?keyword=fishing+report+ridgway+reservoir In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_4f30ef273b844e8db05031206df031d2.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/73cb9e_4b15182f170d41268e3384037a64596a.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/d55797_2652a80837e548c8a6cb5b1ca18d4037.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/d775a9_53965ba8b3d5434c9789aaf4e6a0a152.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/9cb927_6349c7313ac24c199277177f07ded395.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/72b0e7_bac1ef146fc24e46a1b54c6df3656e1d.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_0c019b9e74c742288d9546c192187095.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b4f0c6_04c2dda780f144b6826682a0aa313bac.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/4914/6778/files/caillebotis_diamond.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3193/6674/files/discord_app_apk.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5403/0231/files/17858729759.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/2257/9869/files/cooking_pot_terraria.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0994/1415/files/fomovoxopibizasufazarimo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/9258/8184/files/diwodosizobojanomeke.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8025/3593/files/damigama.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/8345/4872/files/60385124344.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008f41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F41 5400 bytes
SHA-256: 79cd802c9ec8f3cbf17a46b4941ca072747355a4658f7defc8df769e4853b99c
font_01_sfnt_off0000a1b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA1B9 10764 bytes
SHA-256: 252f1aadee2edd88b4d5fd070de750b0350abfbc9dd3dc5b8a82f521045c9615

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