Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e7312a68389c5a9…

MALICIOUS

PDF

37.9 KB Created: 2020-08-29 23:26:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0ce3eef61df7aeebc0b12cb458d764d5 SHA-1: 9444d1f7844b082eb3c9543721c8a6b4c3b20ffd SHA-256: 7e7312a68389c5a9f30cb8c1d3566d4cb3e9f6c2b14f88dc46a7d98b017e2c3d
152 Risk Score

Malware Insights

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

This PDF was flagged as malicious by a machine learning classifier and contains a large number of embedded links, many pointing to external PDFs. One of the primary links directs to a known malicious redirector, ttraff.com, which is likely used to obscure the final destination or distribute further malware. The document body itself is largely unreadable binary data, but the presence of the malicious redirector and the link farm strongly suggest a malicious intent, possibly for SEO poisoning or to lure users to malicious sites.

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.com/wix?keyword=premo+polymer+clay+color+mixing+chart
    • https://cdn.shopify.com/s/files/1/0431/3248/5799/files/46504974326.pdf
    • https://cdn.shopify.com/s/files/1/0429/8312/9251/files/tiduwiwu.pdf
    • https://cdn.shopify.com/s/files/1/0429/7608/4117/files/916_758_8669.pdf
    • https://static.usrfiles.com/ugd/b8c837_e5ee22d5d4194382b5ba869f65d86ee1.pdf
    • https://static.usrfiles.com/ugd/3649d2_6de68b0238cd456ebfb67b9b94360415.pdf
    • https://static.usrfiles.com/ugd/b8c837_fb6451e830434a869b0256e0a060551a.pdf
    • https://static.usrfiles.com/ugd/b8c837_fe21bb3b5f854e4bb769562a51c4d40a.pdf
    • https://static.usrfiles.com/ugd/b8c837_7cda6eb667ad437ca740bd61b864e9b8.pdf
    • https://static.usrfiles.com/ugd/b8c837_3c3cc0356b834e2e870de99316f5df94.pdf
    • https://static.usrfiles.com/ugd/b8c837_ba385a38c96a47f6959ba425c99e3d8d.pdf
    • https://static.usrfiles.com/ugd/ea2f88_5c282c3012664f8c80b821f1a4f61943.pdf
    • https://static.usrfiles.com/ugd/02beb7_e10db94649ca40b4bc0d6154519a2267.pdf
    • https://static.usrfiles.com/ugd/b8c837_eb8f0d6663694b40a20dccc2731d356b.pdf
    • https://static.usrfiles.com/ugd/b8c837_e41261e3f39d47ac8a0695c7094588b7.pdf
    • https://static.usrfiles.com/ugd/b8c837_b9f20112b7ef404e8736a04c8652b97b.pdf
    • https://static.usrfiles.com/ugd/b8c837_e21ebc83e53545c0992db7a8490f7f50.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_off00005623.bin
249d4666be2f5b6ff4d7f00a2c02bcdac58ba008d76a20168851f2fb848b5faf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5623 5340 bytes
font_01_sfnt_off00006829.bin
896b93876da3528666df59e95eedc4f8c05757646dc5316e056555a15e934ea6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6829 10156 bytes

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