Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1bd7c7e98891e9f…

MALICIOUS

PDF

76.2 KB Created: 2020-08-09 22:26:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: d70ca027749251898e1ecb22e79ce1ed SHA-1: 92e936ade83a56470b6ba07c9f2d2434ff93971d SHA-256: a1bd7c7e98891e9f8ebc9065619aad2217b81908c01d0e1be7d9423f70a0f5ce
154 Risk Score

Malware Insights

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

The PDF contains embedded links to known malicious redirector infrastructure, specifically `https://ttraff.com/pify?keyword=canula+de+alto+flujo+en+adultos+pdf`. The document body, though heavily obfuscated, contains references to the same URL and appears to be a lure related to medical equipment. The presence of numerous external PDF links further suggests a link farm or SEO poisoning tactic to distribute 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.com/pify?keyword=canula+de+alto+flujo+en+adultos+pdf In PDF document text
    • http://files.laurenfalksoprano.com/uploads/1/3/1/4/131407102/0307f3.pdfIn PDF document text
    • http://files.hubertandbelle.com/uploads/1/3/0/8/130873794/6348132.pdfIn PDF document text
    • http://josafewu.pentacleclub.com/uploads/1/3/1/0/131070356/552693.pdfIn PDF document text
    • http://fixev.silkroadcarpets.com/uploads/1/3/0/9/130969204/5624286.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/8043/4342/files/23260162716.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/5676577217.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/3103/5032/files/81918889950.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/5228/4566/files/basketball_meal_plan.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6617/1297/files/casual_vacancy_vk.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9548/1750/files/xolerosupofamufetifimoju.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/3729/4745/files/jerasopuzawozo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/9945/4628/files/valufumopumawetapelile.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/7866/4867/files/jesedubonodugunovipazivet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/6984/8217/files/abacus_mind_math.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/tekutuni.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_off0000d7d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D3 1696 bytes
SHA-256: c80b935bb2e72fbf0bb54bead4dcf673e2ee9ff5a06d35ab91e29c0786333a85
font_01_sfnt_off0000dffd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFFD 4920 bytes
SHA-256: 527e1be27b481c169020c10fdf776d69f76780781d327d3c541a61e6778c7606
font_02_sfnt_off0000f0d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D8 16100 bytes
SHA-256: aa3a61e851ffe105fef3c351c88ccfe5f1a19ba67531f23c3c2c283924bec1c5

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