Malicious PDF — malware analysis report

Static analysis result for SHA-256 795f8073d83cc521…

MALICIOUS

PDF

40.3 KB Created: 2020-09-02 00:15:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0d3077ee7d93f2f47550ef38f2ece609 SHA-1: d198fb5bdf15eef8bd4741e4d080f86f4620588c SHA-256: 795f8073d83cc5216b3bbe7b2694849d580a6366aad5ff2654ffe42696bfbba9
162 Risk Score

Malware Insights

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

The PDF contains embedded links, with one identified as a malicious redirector pointing to 'ttraff.com'. The document body, though heavily obfuscated, contains text suggesting a lure for 'psd animation free' and includes the malicious URL. The presence of numerous other PDF links, many pointing to 'static.usrfiles.com', suggests a link farm or content aggregation strategy, with the primary malicious intent being redirection via the ttraff.com domain.

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.com/wix?keyword=psd+animation++free
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/eaf48f_4b4f635443e6402b854e8022604ae57c.pdf
    • https://static.usrfiles.com/ugd/fd7405_3b63790fc39844d7b30064da00a23702.pdf
    • https://static.usrfiles.com/ugd/b8c837_456581d623724a0ba0fe5da1d497ffa4.pdf
    • https://static.usrfiles.com/ugd/6e3131_b815c769087647c5b069580cc4162ce7.pdf
    • https://static.usrfiles.com/ugd/f09a9d_09975b96bb114e4f8e55a4fc27bd8f85.pdf
    • https://static.usrfiles.com/ugd/cbdbb6_f39ef7b878f94a74bc7aa71df81a27f3.pdf
    • https://static.usrfiles.com/ugd/01bc73_ef7a8653efb74c1d82dfeccbfd23753b.pdf
    • https://static.usrfiles.com/ugd/6f53d7_a036c2a8b5d54f088dffbd8070733c25.pdf
    • https://cdn.shopify.com/s/files/1/0428/7224/2342/files/kirunijefelo.pdf
    • https://cdn.shopify.com/s/files/1/0434/6413/0726/files/war_thunder_american_planes.pdf
    • https://cdn.shopify.com/s/files/1/0429/9620/3679/files/umberto_eco_apocalpticos_e_integrados.pdf
    • https://cdn.shopify.com/s/files/1/0431/6640/0673/files/17608072048.pdf
    • https://cdn.shopify.com/s/files/1/0434/4433/8838/files/88068134720.pdf
    • https://cdn.shopify.com/s/files/1/0430/7959/8229/files/a_level_chemistry_eileen_ramsden.pdf
    • https://cdn.shopify.com/s/files/1/0437/0425/4615/files/2020_cadillac_ats_2._0t_owners_manual.pdf
    • https://cdn.shopify.com/s/files/1/0428/3075/8044/files/66769954885.pdf
    • https://cdn.shopify.com/s/files/1/0447/9628/0993/files/altium_designer_schematic_tutorial.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_off00005fda.bin
cefd403af92d993445fd54d374fc136459099c279656806af0bc7116697dab36		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FDA 5024 bytes
font_01_sfnt_off000070d4.bin
060695f9e654d3d35eefb28aead2df6d19e79b2b3f11b49d3c2590fb9562c6e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70D4 10404 bytes

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