Malicious PDF — malware analysis report

Static analysis result for SHA-256 13cd5810e73135b9…

MALICIOUS

PDF

44.1 KB Created: 2020-08-09 14:50:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f1c1f78a3e67626413b88cf66060f2e8 SHA-1: 5a96c771e494b4255e8775d23353d3a8418095e0 SHA-256: 13cd5810e73135b987f5f5d6aface6a2b0cfe7ac7001589386f734c4fafb1f7e
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 `https://ttraff.ru/pify?keyword=hindu+marriage+biodata+format+download+pdf`. The document body also contains this URL along with numerous other PDF links, suggesting a link farm designed to attract traffic. The ML classifier also strongly flagged this PDF as malicious. The primary attack pattern involves luring users to a malicious URL under the guise of a document download.

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.ru/pify?keyword=hindu+marriage+biodata+format+download+pdf
    • http://files.sofiasrusticboutique.com/uploads/1/3/0/8/130814390/ramoxovifitipuza.pdf
    • http://files.muncasterfinancial.com/uploads/1/3/1/4/131453713/44f880f75e4c20.pdf
    • http://files.keeversboutique.com/uploads/1/3/0/9/130969580/walibus_nivewokogo_lufovibesuwe_kurisuzinujusa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/5602/9093/files/wenisotudejivi.pdf
    • https://cdn.shopify.com/s/files/1/0432/3983/3767/files/english_file_beginner_teacher_s_book_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/32878299647.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/70354855800.pdf
    • https://cdn.shopify.com/s/files/1/0428/8865/9100/files/abstraction_in_java.pdf
    • https://cdn.shopify.com/s/files/1/0439/7613/0718/files/capital_humano.pdf
    • https://cdn.shopify.com/s/files/1/0433/4351/1706/files/16033288641.pdf
    • https://cdn.shopify.com/s/files/1/0438/1776/2973/files/55820494581.pdf
    • https://cdn.shopify.com/s/files/1/0432/5149/9170/files/american_pie_reunion_putlocker.pdf
    • https://cdn.shopify.com/s/files/1/0428/2168/1315/files/fisanesolinonawaj.pdf
    • https://cdn.shopify.com/s/files/1/0440/0021/5190/files/nezetos.pdf
    • https://cdn.shopify.com/s/files/1/0429/5376/9126/files/nuniwuxexexum.pdf
    • https://cdn.shopify.com/s/files/1/0429/3607/4396/files/78212729502.pdf
    • https://cdn.shopify.com/s/files/1/0431/6522/1028/files/vejuzofaxukex.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_off00006454.bin
9d9c51b6973a7ce2f9bb2ce37b932bbee0421c8758a6f2ce2729805ca788f4ec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6454 5376 bytes
font_01_sfnt_off00007687.bin
e9f8a3ef788f0cbd16162dfcacf3538d4d9f72d83e44e67f72eb93bd53224865		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7687 1912 bytes
font_02_sfnt_off00007fb6.bin
5857cfb4e972c574e36c6c84f559a7c69cfaf2cbb290ccbf0e030d219bcaf8d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7FB6 10208 bytes

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