Malicious PDF — malware analysis report

Static analysis result for SHA-256 b811c92f5a2334f5…

MALICIOUS

PDF

33.9 KB Created: 2020-08-30 14:49:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cca786e74791de4087c96d0bc87e7394 SHA-1: dd848dbd4e527901a1ee88535d0e9b83be6f0b48 SHA-256: b811c92f5a2334f56ebf272593431732e3d87751a3a29a2e89bec57b02614218
152 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to a redirector service (ttraff.cc). This indicates a link farm designed to obscure the final destination and potentially distribute malicious content or conduct phishing. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious redirector.

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.cc/wix?keyword=janeway+immunobiology+8th+edition
    • https://cdn.shopify.com/s/files/1/0459/8815/1458/files/secrets_of_question_based_selling.pdf
    • https://cdn.shopify.com/s/files/1/0434/2333/4567/files/pokemon_emerald_rare_candies_code.pdf
    • https://cdn.shopify.com/s/files/1/0435/1816/5146/files/dujoziremezejawawevu.pdf
    • https://cdn.shopify.com/s/files/1/0432/5238/3902/files/xuverivikom.pdf
    • https://cdn.shopify.com/s/files/1/0435/7344/4767/files/purigemiwefami.pdf
    • https://static.usrfiles.com/ugd/0a0016_c0d1abf7b4d6437cbb05e85aa0196073.pdf
    • https://static.usrfiles.com/ugd/b8c837_79d18a12e5bf4706bb62bc5982b6810e.pdf
    • https://static.usrfiles.com/ugd/b8c837_f0df0ede68d24257857ef5e4911b38e9.pdf
    • https://static.usrfiles.com/ugd/0779a3_9e5ffd4039754ac98fa60c75b999414d.pdf
    • https://static.usrfiles.com/ugd/b0b521_35dbd4fed3254d18be80c18a9530c78d.pdf
    • https://static.usrfiles.com/ugd/79e0dc_1a1770129b9141aeb599d2e402206174.pdf
    • https://static.usrfiles.com/ugd/c4ccc4_203df73910d143609c64b0a4da152550.pdf
    • https://static.usrfiles.com/ugd/0a0016_adaa9cfca9b746f8836a8c6da795da10.pdf
    • https://static.usrfiles.com/ugd/097bd5_7e8e10d9a97d433eab333404dcb31780.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_off00004673.bin
6d91a1aa47dc8f98f0b1efdd7fa8842252a72aaeea739ac38ab589829be29d68
pdf-font-stream PDF embedded font (sfnt) at offset 0x4673 5484 bytes
font_01_sfnt_off00005901.bin
3390b6a5732604602ed40ea53289e16abaff4213f427c57f94575784fd449257
pdf-font-stream PDF embedded font (sfnt) at offset 0x5901 9952 bytes