Malicious PDF — malware analysis report

Static analysis result for SHA-256 33d25732bb6f4999…

MALICIOUS

PDF

52.7 KB Created: 2020-08-24 21:29:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e0b62acbfaa70636f2b016dce2a06135 SHA-1: 82ae223229b154dc1b5efdc53202b134500c8920 SHA-256: 33d25732bb6f499911e3188d06dce6dc15867be846d15e95772f593c40b3227b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link farm designed to appear as legitimate content, specifically "Texas boat ed test answers". The primary malicious indicator is the embedded URL that redirects to a known malicious infrastructure at ttraff.ru. This suggests the document is a lure to redirect users to malicious content. No scripts were extracted from this sample.

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=texas+boat+ed+test+answers
    • http://files.janeymoffatt.com/uploads/1/3/0/7/130740412/puxajewelimaxuwivu.pdf
    • https://cdn.shopify.com/s/files/1/0429/8362/0757/files/mubokejegewakum.pdf
    • https://cdn.shopify.com/s/files/1/0432/7899/1518/files/tumewigovigaxawikatep.pdf
    • https://cdn.shopify.com/s/files/1/0438/5813/3152/files/pupozila.pdf
    • https://cdn.shopify.com/s/files/1/0441/0041/9736/files/86761677945.pdf
    • https://cdn.shopify.com/s/files/1/0432/3393/5519/files/acupressure_potent_points.pdf
    • https://cdn.shopify.com/s/files/1/0437/8833/7303/files/34194747909.pdf
    • https://cdn.shopify.com/s/files/1/0438/9827/3944/files/sevimofudikorob.pdf
    • https://cdn.shopify.com/s/files/1/0431/5208/1053/files/verizon_fios_internet_outage_reports.pdf
    • https://cdn.shopify.com/s/files/1/0430/6976/7842/files/89793886737.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/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000088d0.bin
dd7b880f1c6958317b71933e3175eb4154b1281d355b69180e4ce829e506ee21		 pdf-font-stream PDF embedded font (sfnt) at offset 0x88D0 2828 bytes
font_01_sfnt_off000092ca.bin
f010b01f0be450b50164e02a4cb3518af1d320a1bf0f6c38f27d3f193b21f181		 pdf-font-stream PDF embedded font (sfnt) at offset 0x92CA 5036 bytes
font_02_sfnt_off0000a406.bin
87d90e2157f011be1f2e248c1ae8843fc99b389ef77d5a79b9d67ed0f9b9a80f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA406 10000 bytes

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