Malicious PDF — malware analysis report

Static analysis result for SHA-256 671ee1ce0a5dea3a…

MALICIOUS

PDF

43.2 KB Created: 2020-09-02 16:52:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 089b06c90cf0f5ed0ff10de0da85ef0b SHA-1: 6b45ed137c8497b1b3e50c18310a995b309332d1 SHA-256: 671ee1ce0a5dea3ab84d5213da154bab17aa9b9e83ce785b95e5a1971ab05696
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm designed for SEO manipulation. One prominent link, 'https://ttraff.club/wix?keyword=facebook+app+free++9apps', is flagged as malicious and likely serves as a redirector to a phishing or malware distribution site. The document body, though heavily obfuscated, contains references to the malicious URL, suggesting an attempt to lure users into clicking these links under the guise of free app downloads.

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.club/wix?keyword=facebook+app+free++9apps
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/4638/7367/files/constraint_based_association_rule_mining.pdf
    • https://cdn.shopify.com/s/files/1/0431/5843/8056/files/44673525337.pdf
    • https://cdn.shopify.com/s/files/1/0436/4160/2208/files/fifesezutesubufegufak.pdf
    • https://cdn.shopify.com/s/files/1/0454/7280/9126/files/clifton_beach_surf_report.pdf
    • https://cdn.shopify.com/s/files/1/0430/8028/6372/files/4th_man_out_full_movie.pdf
    • https://static.usrfiles.com/ugd/26481d_91e5815b98cb4dbbb310ed759ec7e45b.pdf
    • https://static.usrfiles.com/ugd/b8c837_b2e86cd413ae45dab10e03ad0104040a.pdf
    • https://static.usrfiles.com/ugd/b8c837_dd79669ea32441c2a7b886e7b9b0e282.pdf
    • https://static.usrfiles.com/ugd/b16523_35a16b4809d24d88b5d51343d36ea6f0.pdf
    • https://static.usrfiles.com/ugd/87b9a8_05f39084ad8b473fa169a6fbbd3df782.pdf
    • https://static.usrfiles.com/ugd/0a593f_2c4fcf1d55864e6091d3d1251e76e303.pdf
    • https://static.usrfiles.com/ugd/1be480_d1c4ca28b9cd4c41a8b70e87148e6a73.pdf
    • https://static.usrfiles.com/ugd/0ebc1f_6bdee578624c4565864cba4e0dd9f320.pdf
    • https://static.usrfiles.com/ugd/b7306e_45a24bb6f6dd49d5b2caa44427ee016c.pdf
    • https://static.usrfiles.com/ugd/b8c837_80cac8eeca774c5aaaac7f0051ac1ef8.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_off000069b7.bin
f0a183d9bdfbcc922a78ebe3b07e77ddf2b03cac599ed3eae43df8e03e537e16		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69B7 5292 bytes
font_01_sfnt_off00007bc7.bin
837a9a0f839d5215200381dcfeaa4a7537feecaad7f768e1e0bf449033f4d33b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7BC7 10680 bytes

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