Malicious PDF — malware analysis report

Static analysis result for SHA-256 7583b05dd0ebcf6d…

MALICIOUS

PDF

72.0 KB Created: 2020-09-10 11:22:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 35a2ba9aa92330ea5d6c2614344dbc0a SHA-1: ae7ff7937de26c55f5c9fa68317c6b017e631c87 SHA-256: 7583b05dd0ebcf6d4efcae7d2217b0b56b0b5e69e8f11bc18e46762a5ba20c2c
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for linking to known malicious redirector infrastructure, specifically pointing to 'https://ttraff.club/wix?keyword=template+for+rescinding+offer+letter'. The document body, though heavily obfuscated, also contains this URL, suggesting a phishing or scam attempt. The presence of numerous external PDF links further indicates a link farm or redirection strategy.

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=template+for+rescinding+offer+letter In PDF document text
    • http://bivizipuw.hillcityseniorcenter.org/uploads/1/3/0/9/130969723/xomuloxezaridan-widalupumuvux.pdfIn PDF document text
    • http://xemub.youthaidnonprofit.org/uploads/1/3/0/7/130775257/1952913.pdfIn PDF document text
    • http://files.esquimalttaxi.com/uploads/1/3/1/0/131071209/kugodawumemajizid.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static.usrfiles.com/ugd/4e6dd5_284c9d075aef4be1994a3a16156fae38.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/83d902_c49ba9b66212447f9506071e789cd42a.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/c450b2_ba701f9120234dd3ae98c6dba38de285.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/afe78f_dc8fe6d097d74ea8ba8fb3a4ef4d4bb0.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/2728/1558/files/aprendizaje_autonomo_que_es.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8627/4967/files/nobuneve.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0610/7552/files/personal_trainer_job_description_pdf.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6574/5314/files/96028775497.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c9d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9D4 2828 bytes
SHA-256: 3b89a1333aa93e194de12c5c5da229a8f3a969ace6b07a90c5323b9ece6747ec
font_01_sfnt_off0000d3cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3CF 5424 bytes
SHA-256: 76b6f41841a1da61cdfdd36181edb7a35f0cfdf713376e686f6d5bcce304e968
font_02_sfnt_off0000e629.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE629 13496 bytes
SHA-256: 3f5bf4e5003b227bf99d732a8db91c4f065b82c6ebe483d91728d9d67d97427d

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