Malicious PDF — malware analysis report

Static analysis result for SHA-256 71f996364e489f95…

MALICIOUS

PDF

51.4 KB Created: 2020-08-31 03:12:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6a65ce3198998915fc82fb3cabd22fcc SHA-1: c3dd607eab12f13ae99fea72b29230064b85678e SHA-256: 71f996364e489f95b03e848ca71e0e0371c304cee33ae8d9c5f0ef90553c358c
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for linking to known malicious redirector infrastructure, specifically pointing to 'https://ttraff.com/wix?keyword=unknown+opcode+epsxe'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded links, many of which are benign Shopify URLs but likely serve to obscure the malicious intent. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious redirector or downloader.

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=unknown+opcode+epsxe
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/3872/8611/files/25367901681.pdf
    • https://cdn.shopify.com/s/files/1/0436/8970/5625/files/19339849862.pdf
    • https://cdn.shopify.com/s/files/1/0430/2022/2627/files/tikav.pdf
    • https://cdn.shopify.com/s/files/1/0432/3858/8584/files/gerapatobidusuxopewa.pdf
    • https://cdn.shopify.com/s/files/1/0434/0360/8214/files/fegiledelelimata.pdf
    • https://static.usrfiles.com/ugd/79e0dc_08d7882393c04a60a1c9ff32be56b15b.pdf
    • https://static.usrfiles.com/ugd/b8c837_6ed8935f978a4a2e8e66d38e56bbc9ac.pdf
    • https://static.usrfiles.com/ugd/b8c837_29d012bf2c4844658994e1a5db8f2014.pdf
    • https://static.usrfiles.com/ugd/b8c837_1ac3c43eabc7466497d2b29eb1063d4c.pdf
    • https://static.usrfiles.com/ugd/f3ecbe_64a8ea1f954a4380b7139d422346dae1.pdf
    • https://static.usrfiles.com/ugd/b8c837_d84a30ca314344718c75cd84b6c6660e.pdf
    • https://static.usrfiles.com/ugd/b8c837_de221f358af14cefb7bdd19a92485e94.pdf
    • https://static.usrfiles.com/ugd/b8c837_0033ea4452db4d5b989bf92049294be2.pdf
    • https://static.usrfiles.com/ugd/b8bbd7_a99d2afba1474d52bd5a49e9bc7741f7.pdf
    • https://static.usrfiles.com/ugd/a2d007_1692cd8e70054a788c883a9dca234558.pdf
    • https://static.usrfiles.com/ugd/b47706_e69b35c49b5d419ba3cbcdd1bde2525e.pdf
    • https://static.usrfiles.com/ugd/34e21e_3a08528222844cea949e2881eee63d69.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007fa9.bin
26cd4b7c216739b2855cf77b0882590b680568829e9e0af8426bb36846f61eed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7FA9 3184 bytes
font_01_sfnt_off00008afe.bin
4b61bc24d2adef2b77486ef3c814549c485dc7e576c6f7375abd3a00660535dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8AFE 4944 bytes
font_02_sfnt_off00009bfe.bin
abafddb0e76aaf16fcacc7491b583fd15067b7d52df8e76e0c4f554a86eb8368		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9BFE 10540 bytes

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