Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8a4c90db2aeb03d…

MALICIOUS

PDF

46.6 KB Created: 2020-08-05 05:36:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d3ea68e82856b31b704b700011463781 SHA-1: 3446392659aa42f462ff29490713e347a0912bf2 SHA-256: a8a4c90db2aeb03d9c25f6f6da09f5437e0de87162712171f34c49c5a1cf13c5
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.com/wb?keyword=geometry%20practice%20problems%20pdf'. This indicates an attempt to lure users to a malicious site. The document also contains a large number of external PDF links, many hosted on Shopify, suggesting a link farm or SEO poisoning tactic to increase visibility. The ML classifier 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.com/wb?keyword=geometry%20practice%20problems%20pdf
    • http://files.mrserickagraham.org/uploads/1/3/0/9/130968921/purujaxow.pdf
    • http://files.makersoverdreamers.com/uploads/1/3/2/6/132681665/fefaxa.pdf
    • http://files.andrewmichaelart.com/uploads/1/3/1/4/131408529/59fa416c9cccb3.pdf
    • https://cdn.shopify.com/s/files/1/0436/4196/2649/files/45935743726.pdf
    • https://cdn.shopify.com/s/files/1/0429/6992/3740/files/materiales_dentales_panamericana.pdf
    • https://cdn.shopify.com/s/files/1/0434/0714/7166/files/31481720125.pdf
    • https://cdn.shopify.com/s/files/1/0430/9313/1425/files/89366763206.pdf
    • https://cdn.shopify.com/s/files/1/0431/0709/0598/files/72327996702.pdf
    • https://cdn.shopify.com/s/files/1/0428/5346/6271/files/natops_manuals_online.pdf
    • https://cdn.shopify.com/s/files/1/0429/7077/5706/files/26923338374.pdf
    • https://cdn.shopify.com/s/files/1/0427/3415/7991/files/77843270531.pdf
    • https://cdn.shopify.com/s/files/1/0427/7141/5196/files/21965393139.pdf
    • https://cdn.shopify.com/s/files/1/0430/8549/6482/files/96233857047.pdf
    • https://cdn.shopify.com/s/files/1/0429/6844/9180/files/54893027963.pdf
    • https://cdn.shopify.com/s/files/1/0433/9079/5941/files/baking_scones_recipes.pdf
    • https://cdn.shopify.com/s/files/1/0427/7898/4614/files/41765399085.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_off0000620f.bin
ed362625dff00ffc1fde120fa0a9646d81f79188853eb2ad88fda49830df0397		 pdf-font-stream PDF embedded font (sfnt) at offset 0x620F 5572 bytes
font_01_sfnt_off000074f0.bin
b29646a9bfb40b1a83c47beec65871c4d0358b006919ce717606bf8f32aa3b50		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74F0 10456 bytes
font_02_sfnt_off000098b2.bin
f3b752e25d2e3098dc5b351a512c5ca672d2b137fcb7ddb3f81b2384be51d5c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x98B2 16072 bytes

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