Malicious PDF — malware analysis report

Static analysis result for SHA-256 74bee2a0957cbbe7…

MALICIOUS

PDF

95.2 KB Created: 2020-09-08 20:19:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7fdca7e4382e1d114d26380ea78bca0e SHA-1: bfc0b8b45f088ddb28ad0a8724ccf8b00da95be3 SHA-256: 74bee2a0957cbbe770977c59ac6fea670245880cc1679e1a61ef536e147847e7
154 Risk Score

Malware Insights

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

This PDF document contains a link to a known malicious redirector infrastructure, identified by the heuristic PDF_MALICIOUS_REDIRECTOR_LINK. The document body, though heavily obfuscated, also contains the URL https://ttraff.club/wix?keyword=bts+answer+album+songs, which is likely the primary malicious payload delivery mechanism. The presence of numerous other PDF links suggests a link farm or SEO poisoning attempt to distribute the malicious content.

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=bts+answer+album+songs
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/21e6f2_f7ca0878abd5447db1b47ae7d71e2b7f.pdf
    • https://static.usrfiles.com/ugd/4c3d6a_e964677e0af540dcb72beac61d0c7740.pdf
    • https://static.usrfiles.com/ugd/ade4e6_6ddd16eb1e5845fda6d20deaba2b1a5b.pdf
    • https://static.usrfiles.com/ugd/b58d21_aa225d0e552945bca0fa639ea796a6bf.pdf
    • https://static.usrfiles.com/ugd/9c43ec_628c2c516c9b4624ab4bed2a63ab9f02.pdf
    • https://static.usrfiles.com/ugd/8a419d_e2c3c83224ea4e58b20dc8e08a4a1b58.pdf
    • https://static.usrfiles.com/ugd/03f576_ff293de7f1f944ffb38cd0844934db86.pdf
    • https://static.usrfiles.com/ugd/70c1f8_7ac6a7f84ab446ecbf560a1ffff0c2be.pdf
    • https://cdn.shopify.com/s/files/1/0436/2603/7411/files/arreglos_unidimensionales_en_java.pdf
    • https://cdn.shopify.com/s/files/1/0428/6775/3116/files/fenenu.pdf
    • https://cdn.shopify.com/s/files/1/0429/9220/5978/files/gazojupavanomipulogakowir.pdf
    • https://cdn.shopify.com/s/files/1/0430/6560/6301/files/conceptual_physics_10th_edition_answers.pdf
    • https://cdn.shopify.com/s/files/1/0429/4737/9356/files/45853841041.pdf
    • https://static.usrfiles.com/ugd/b8c837_1868644f22254e8fa3d860ac5f3c841c.pdf
    • https://static.usrfiles.com/ugd/8a419d_825ac40e296d4b76a1ed34a0874749b7.pdf
    • https://static.usrfiles.com/ugd/a382ee_ed26088e3fbc4a80b715a13e83ce3800.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_off0000d5bb.bin
988d198fad2e8594abdc9fe9a35291b84178653f06f864382d99bc5cb629a6cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD5BB 26876 bytes
font_01_sfnt_off00012857.bin
a528d2d1f1926b8bad60d8a5f99a3c830767b9fe7a91924bc21656f63a377162		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12857 5288 bytes
font_02_sfnt_off00013a52.bin
0f9ed11dc56085a25dcdadefa0558a6d3948dcaf2d590ab15f97876cd7a73f86		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13A52 16880 bytes

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