Malicious PDF — malware analysis report

Static analysis result for SHA-256 11d1cadaab467e94…

MALICIOUS

PDF

36.1 KB Created: 2020-08-20 02:08:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5421372a7936da029fa3719612c72fa2 SHA-1: dac903c94cde7c35112f5603f55c07ac1113d46d SHA-256: 11d1cadaab467e9482280a2dba32e9e29bcbc6b232ab23dc48fa4c39e5c14c94
154 Risk Score

Malware Insights

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

The PDF contains embedded links designed to redirect users to malicious infrastructure, masquerading as an educational worksheet. The primary malicious URL identified is https://ttraff.cc/pify?keyword=declarative+and+interrogative+sentences+worksheet+2nd+grade, which is part of a link farm. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest an attempt to lead the user to a malicious site, likely for further exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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=declarative+and+interrogative+sentences+worksheet+2nd+grade
    • http://begudukuw.aroosterstale.com/uploads/1/3/1/0/131070420/3518704.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/9435/1778/files/77135302559.pdf
    • https://cdn.shopify.com/s/files/1/0431/1616/7328/files/mizoxojogapasevapupasak.pdf
    • https://cdn.shopify.com/s/files/1/0440/0496/6565/files/snoop_dogg_tha_doggfather_zip.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/32878299647.pdf
    • https://cdn.shopify.com/s/files/1/0435/2265/4362/files/reliz.pdf
    • https://cdn.shopify.com/s/files/1/0432/7263/4536/files/les_neurones_enchants.pdf
    • https://cdn.shopify.com/s/files/1/0429/2804/6233/files/takok.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_off00004e7d.bin
7b836299dd76a021e9e373f3bc417186747e4affd191376b46122b231ae9be9a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4E7D 5548 bytes
font_01_sfnt_off00006170.bin
201706fd8facfff8aee10bb9ebb737268b2be1b1d4636c60eaaabffc0e8a6beb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6170 9992 bytes

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