Malicious PDF — malware analysis report

Static analysis result for SHA-256 68d0f60a5f5c0cac…

MALICIOUS

PDF

48.6 KB Created: 2020-08-27 13:19:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 141d479413f63702986d95f55a3cc484 SHA-1: 55e59155a2f191e6c58e1be2f79b26391af8a696 SHA-256: 68d0f60a5f5c0cac261028336bfcfe770001b223fa36f9d388a4d39baf86c14b
154 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing for a malicious redirector link, pointing to `https://ttraff.link/pify?keyword=safety+not+guaranteed+%25282012%2529`. Additionally, it exhibits characteristics of a PDF link farm, embedding numerous external PDF links, with `https://cdn.shopify.com/s/files/1/0431/2032/8864/files/census_data_2020.pdf` being the first identified. The ML classifier also strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of embedded URLs and the redirector link suggest an attempt to lure users to malicious content, likely as a spearphishing attachment.

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.link/pify?keyword=safety+not+guaranteed+%25282012%2529
    • http://files.dandylifenutrition.com/uploads/1/3/1/3/131382808/suzomegadumem.pdf
    • http://bedijev.cincinnatikelts.com/uploads/1/3/0/8/130874289/mafemasariwuxad.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/2032/8864/files/census_data_2020.pdf
    • https://cdn.shopify.com/s/files/1/0437/7716/3416/files/dipew.pdf
    • https://cdn.shopify.com/s/files/1/0460/9877/6228/files/arteriovenous_malformation_lungs.pdf
    • https://cdn.shopify.com/s/files/1/0428/8803/6505/files/gabajasidexufufa.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/70354855800.pdf
    • https://cdn.shopify.com/s/files/1/0428/5346/6271/files/76580825165.pdf
    • https://cdn.shopify.com/s/files/1/0431/3173/2122/files/buranadizizemu.pdf
    • https://cdn.shopify.com/s/files/1/0438/0177/2192/files/time_zone_abbreviations.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/38746106010.pdf
    • https://cdn.shopify.com/s/files/1/0437/0595/8553/files/thermodynamics_an_engineering_approach.pdf
    • https://cdn.shopify.com/s/files/1/0428/5969/2198/files/gipomunugar.pdf
    • https://cdn.shopify.com/s/files/1/0434/1845/2120/files/reading_comprehension_worksheets_7th_grade.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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00009c20.bin
797aadc8c72fd77990e85d580ffcb4b78ec4bbbf0ec17285bf5319aa56422961		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x9C20 17320 bytes
font_00_sfnt_off000064f8.bin
8d576ef98e3d56eba8f08759977ecc14f6e48edb4b0832f8a65f35bc46255e0d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64F8 5548 bytes
font_01_sfnt_off000077ff.bin
6b72e4fedd07d31b37442fafd64cd3bd491dd4aef2092151334b44314235e688		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77FF 10536 bytes

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