Malicious PDF — malware analysis report

Static analysis result for SHA-256 341d0eb782a4fedb…

MALICIOUS

PDF

38.4 KB Created: 2020-08-29 10:17:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3a6bde5a1f6db35cd4360d64d1f89cfb SHA-1: f5ba6ec7333268f401af19935fb89ded7a34aaee SHA-256: 341d0eb782a4fedb3148bfafe94d9aaf6d2c8a6b59a659b6a0c0edcbdfe71c06
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, many of which point to a link farm designed to generate traffic. One prominent link, 'https://ttraff.ru/wix?keyword=hot+guys+calendar+2016', is flagged as a malicious redirector. The presence of a 'download button' heuristic and the ML classifier's high confidence further support malicious intent. The document body, though heavily obfuscated, contains the malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=hot+guys+calendar+2016
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_fc8c2cb50eb44ad7bc8a04a14cb559bd.pdf
    • https://static.usrfiles.com/ugd/b8c837_83d9601ec8064fedad76d0083f4f3d32.pdf
    • https://static.usrfiles.com/ugd/b8c837_e8e7c30b520c4ffebb6fd17377e90353.pdf
    • https://static.usrfiles.com/ugd/b8c837_3e549cd80b714a3b94fd25af501a2815.pdf
    • https://static.usrfiles.com/ugd/b8c837_9e555a8fb9454e799ab6494884fca9d0.pdf
    • https://static.usrfiles.com/ugd/b8c837_61e119bca487421284204987d34357d4.pdf
    • https://static.usrfiles.com/ugd/b8c837_1ede96c9dcb748bda1a934e1a71a156e.pdf
    • https://static.usrfiles.com/ugd/b8c837_808f5e4e469544c9a9b318165073737b.pdf
    • https://static.usrfiles.com/ugd/b8c837_af6b54b025fe416da52ec83a393ae1ad.pdf
    • https://static.usrfiles.com/ugd/b8c837_81432d7ddcb1452f9123bbef2aaf12b7.pdf
    • https://static.usrfiles.com/ugd/b8c837_0a016298cd264e08830d91a2ceb502ad.pdf
    • https://static.usrfiles.com/ugd/b8c837_1cca151932c04f19ba94db3104cbf18e.pdf
    • https://static.usrfiles.com/ugd/b8c837_e3eed76385524d2680b120440fff8d88.pdf
    • https://static.usrfiles.com/ugd/b8c837_f14da6fe51c5423a8707e5a9054c9234.pdf
    • https://static.usrfiles.com/ugd/b8c837_3f66f03741b147d385a27749e24f2d19.pdf
    • https://static.usrfiles.com/ugd/b8c837_1c00696732ad4401bc664535a87739c7.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_off00005429.bin
5c11af7da3ee4063ec9c2efa1e00023c53c94c5de3bf2f984b119a9cc037fe11		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5429 5652 bytes
font_01_sfnt_off0000677d.bin
8ed9aaf591f3decbf518e6f0d164c7c66dcf07acc6fa625bf2e3f41cc2d24dae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x677D 11712 bytes

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