Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9e5741221fb3072…

MALICIOUS

PDF

39.4 KB Created: 2020-08-29 15:37:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2d4075e31fd2b0d220bb3d8302d6ec88 SHA-1: d6fb81f6def47452e5bc672d6686af751a8619a7 SHA-256: c9e5741221fb30727e4f182d3180b2ca72611c0369d5cd945183fc38d9274696
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious due to its inclusion of a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the URL https://ttraff.ru/wix?keyword=servis+fridge+freezer+manual+m7065s, which is flagged as malicious. Additionally, the PDF exhibits characteristics of a link farm, with numerous embedded URLs pointing to external resources, suggesting an attempt to manipulate search engine results or distribute further malicious 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://ttraff.ru/wix?keyword=servis+fridge+freezer+manual+m7065s
    • https://static.usrfiles.com/ugd/b8c837_13ce0eeecd6e4b1cb1a61e37d3975bd8.pdf
    • https://static.usrfiles.com/ugd/b8c837_e92239d1f71f462a970f23ad998aaf7b.pdf
    • https://static.usrfiles.com/ugd/b8c837_59a3f8f832df406fada6ea5a6ff290ce.pdf
    • https://static.usrfiles.com/ugd/b8c837_bc438509ef674caf95ed813883331695.pdf
    • https://static.usrfiles.com/ugd/b8c837_9e2d0362b9c4402db62c9296864173e9.pdf
    • https://static.usrfiles.com/ugd/b8c837_6102768d76804396873798d0d77a7a9f.pdf
    • https://static.usrfiles.com/ugd/b8c837_da5cbadefd1b449c8b1031826a4d9e80.pdf
    • https://cdn.shopify.com/s/files/1/0435/1705/1039/files/automate_the_boring_stuff.pdf
    • https://cdn.shopify.com/s/files/1/0433/6225/5006/files/18228267937.pdf
    • https://cdn.shopify.com/s/files/1/0454/7071/1958/files/flight_of_the_bumblebee_violin_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0428/4196/4710/files/runifuxomolafokexom.pdf
    • https://cdn.shopify.com/s/files/1/0427/4746/1788/files/central_budget_2020_in_kannada.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/31968244380.pdf
    • https://cdn.shopify.com/s/files/1/0438/2900/2390/files/35418922569.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000057cb.bin
47c32b4c389c670f77e8dd200a33528a0c9463058729fc3e6d3cdc45f1147530
pdf-font-stream PDF embedded font (sfnt) at offset 0x57CB 5940 bytes
font_01_sfnt_off00006bfe.bin
4aed7f7cfd7d4dc8b8c6867f5c08529dcc25dd083d67e5f58fa283731ba61653
pdf-font-stream PDF embedded font (sfnt) at offset 0x6BFE 10780 bytes