Malicious PDF — malware analysis report

Static analysis result for SHA-256 1394fdd093b36dd5…

MALICIOUS

PDF

47.7 KB Created: 2020-08-29 21:56:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5126a8b49315afe288805deb4122ab2a SHA-1: a1a99cb40f6e48fe025f11668fa898ce157a956f SHA-256: 1394fdd093b36dd5ac3d8399b630662acbf2898bc449959929ef211f3b42cc68
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm designed to direct users to a malicious redirector at 'https://ttraff.ru/wix?keyword=silverthorne+publications+pdf'. The ML classifier strongly indicated maliciousness, and the presence of numerous external links, many pointing to Shopify, suggests a tactic to obscure the true malicious destination. No scripts were extracted, limiting further analysis of the payload.

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.ru/wix?keyword=silverthorne+publications+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/4007/7981/files/best_android_apps_requiring_root_access.pdf
    • https://cdn.shopify.com/s/files/1/0428/7932/0223/files/catia_composer.pdf
    • https://cdn.shopify.com/s/files/1/0432/1008/0420/files/image_converter_psd_to_jpg_apk.pdf
    • https://cdn.shopify.com/s/files/1/0434/2182/7222/files/99725742847.pdf
    • https://cdn.shopify.com/s/files/1/0463/2569/4619/files/lasavew.pdf
    • https://static.usrfiles.com/ugd/7d1dc9_3169bae1ed3445818706d28770798766.pdf
    • https://static.usrfiles.com/ugd/b8c837_8b9369de28884babb502e35e5b2e1cb9.pdf
    • https://static.usrfiles.com/ugd/b8c837_6cf9a6261fb5429da0ff630d38187111.pdf
    • https://cdn.shopify.com/s/files/1/0428/8974/0441/files/56100430895.pdf
    • https://cdn.shopify.com/s/files/1/0433/7840/9622/files/allahabad_kondapuram_movie_songs_in_telugu.pdf
    • https://cdn.shopify.com/s/files/1/0464/6046/9400/files/suxopowitaxadelep.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rejumaxerufu.pdf
    • https://cdn.shopify.com/s/files/1/0431/0663/1833/files/wiczenia_z_jzyka_angielskiego_dla_pocztkujcych.pdf
    • https://static.usrfiles.com/ugd/0c41e7_8c3e008e87bd44c3b74d49020d9502c3.pdf
    • https://static.usrfiles.com/ugd/b8c837_e0120433f8ed46b1b7e740f4ad7a52f0.pdf
    • https://static.usrfiles.com/ugd/b8c837_58bfa08929de4765a34c6c8a5e712f61.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_off0000788e.bin
71ae4d1dfbbbb360db1498e8c6db97ce4004ee9161d07da180afed69a23f38c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x788E 5544 bytes
font_01_sfnt_off00008b57.bin
5e99e2b10295e4040dcd6a0248850b00050f72f18109ae1105d2397ea90aa63b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B57 11872 bytes

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