Malicious PDF — malware analysis report

Static analysis result for SHA-256 82e00576413868b3…

MALICIOUS

PDF

46.0 KB Created: 2020-08-19 02:05:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 25df5d4cab332592c7399b66560db4ef SHA-1: eb94cfd79f62f8eef6abae50870b4e89ee4d9620 SHA-256: 82e00576413868b38db42dc7afcf3d8531d066f0fe5c2d061c90b3277875082a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to external PDFs, suggesting a link farm or SEO poisoning attempt. One critical heuristic identified a link to known malicious redirector infrastructure (ttraff.cc), indicating a potential phishing or malware distribution vector. The ML classifier also strongly flagged this PDF as malicious.

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.cc/pify?keyword=carnatic+instrumental+music+ringtones+free
    • http://files.toolshedtools.com/uploads/1/3/0/8/130813558/pulel-vesasivexaroda-rozatorutom.pdf
    • http://files.wilestyle.com/uploads/1/3/1/4/131408798/bubowoboze.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/4416/7064/files/53553406614.pdf
    • https://cdn.shopify.com/s/files/1/0435/3461/4688/files/bank_exams_today_aptitude.pdf
    • https://cdn.shopify.com/s/files/1/0428/1057/2967/files/50109825224.pdf
    • https://cdn.shopify.com/s/files/1/0435/3051/8682/files/megasulinadamovaju.pdf
    • https://cdn.shopify.com/s/files/1/0429/4744/4899/files/84335081230.pdf
    • https://cdn.shopify.com/s/files/1/0429/0933/5715/files/20337750654.pdf
    • https://cdn.shopify.com/s/files/1/0430/0010/3073/files/74859046002.pdf
    • https://cdn.shopify.com/s/files/1/0437/8548/6498/files/26218140548.pdf
    • https://cdn.shopify.com/s/files/1/0433/6877/5841/files/libro_aura_en_ingles.pdf
    • https://cdn.shopify.com/s/files/1/0431/4087/4408/files/sosukavasidudo.pdf
    • https://cdn.shopify.com/s/files/1/0443/9392/2726/files/little_caesars_pizza_menu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/8402105605.pdf
    • https://cdn.shopify.com/s/files/1/0435/5345/6289/files/events_coordinator_interview_questions_and_answers.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_off000073ee.bin
4e1d69b9dce5da1f4f05ce8b1720ae9424733af086e9237bb32c5dcb7eb04786
pdf-font-stream PDF embedded font (sfnt) at offset 0x73EE 5104 bytes
font_01_sfnt_off00008534.bin
b1a3d2cf16f27e20c09c9bd3b0a191bb64cf23cedb3ac91dd98e5a4ded4ee078
pdf-font-stream PDF embedded font (sfnt) at offset 0x8534 11472 bytes