Malicious PDF — malware analysis report

Static analysis result for SHA-256 165e969758797db3…

MALICIOUS

PDF

34.3 KB Created: 2020-08-31 04:18:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9c3afd5f326e19bf067834c0c07b86e4 SHA-1: 039cf87232debcbcd8449d9a5ef0fb1abfa0f219 SHA-256: 165e969758797db3187503549c8d5ca3c12834a537c507087609ad6ebc8f336f
154 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link pointing to 'https://ttraff.com/wix?keyword=sony+urx+p2', which is flagged as malicious. Additionally, the PDF exhibits characteristics of a link farm, embedding numerous links to external PDFs. The ML classifier strongly indicated maliciousness, and the document body, though heavily obfuscated, contains the malicious URL.

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=sony+urx+p2
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/0c41e7_3448ee061feb4817bd17adeb19567b8e.pdf
    • https://static.usrfiles.com/ugd/6908d7_cedd4fb6f5f8496ebd8e9d55eaae8eeb.pdf
    • https://static.usrfiles.com/ugd/7198c1_612d7dc66ccd4b4ab22ff8228d9a6701.pdf
    • https://static.usrfiles.com/ugd/b58d21_c1c2bf8334b04b2bb060e4f2983c5c1c.pdf
    • https://static.usrfiles.com/ugd/b8c837_0a6bda7af1f449e880e4ca11bba2ed33.pdf
    • https://static.usrfiles.com/ugd/72216b_82d6416403e7467aadb8bc6aef75f2cb.pdf
    • https://static.usrfiles.com/ugd/921909_eb6246c8e10741e292faee5c5b54aa3e.pdf
    • https://static.usrfiles.com/ugd/c12414_0b6c3a753cf644cba2cd8e8792e8a8ad.pdf
    • https://static.usrfiles.com/ugd/769f78_14a0eedfeb21407583a68944118a3b25.pdf
    • https://static.usrfiles.com/ugd/b444d4_38b3773de94643dda6b59972f5a7fd91.pdf
    • https://static.usrfiles.com/ugd/b8c837_1de87f838e7b449388f40ad979f462a4.pdf
    • https://static.usrfiles.com/ugd/ee6770_2e287e58ced64da18dadc24202e8f2bd.pdf
    • https://cdn.shopify.com/s/files/1/0432/4347/1008/files/bubble_answer_sheet_1_60.pdf
    • https://cdn.shopify.com/s/files/1/0433/4351/1706/files/atresia_duodenal_clasificacion.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_off00004b91.bin
6b4013d6d6e332ce02c42365b13a54bc0ef019936eb5446b32575e2fdaf10e0a
pdf-font-stream PDF embedded font (sfnt) at offset 0x4B91 4796 bytes
font_01_sfnt_off00005bfb.bin
0dcf36b3f18cab293615e9060d821fd8bbca17813937245c591804016996cd95
pdf-font-stream PDF embedded font (sfnt) at offset 0x5BFB 9676 bytes