Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7f72743bc32f594…

MALICIOUS

PDF

40.2 KB Created: 2020-08-29 22:32:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c31510e84bb3efa6b87f76e2a65df3cc SHA-1: 7ab32abbaea20b6441c5196fc373f8102ebe6e6f SHA-256: e7f72743bc32f5940f2e4582cd4a8c38ca8f36b2ceb8d0f9acd2316d6774e63f
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/wix?keyword=the+internship+free+download'. This URL is presented within the document body, suggesting a social engineering lure to trick users into downloading further content. The PDF also contains a large number of external links, many hosted on cdn.shopify.com, which is flagged as a link farm. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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/wix?keyword=the+internship+free+download
    • https://cdn.shopify.com/s/files/1/0428/7463/4403/files/76317042961.pdf
    • https://cdn.shopify.com/s/files/1/0431/4162/8072/files/62352424654.pdf
    • https://cdn.shopify.com/s/files/1/0431/1898/5377/files/crazy_redd_painting_guide_wild_world.pdf
    • https://cdn.shopify.com/s/files/1/0429/7061/1871/files/xagajixefozefip.pdf
    • https://static.usrfiles.com/ugd/b8c837_92d5d119bc1b45deaae62c4b49be2046.pdf
    • https://static.usrfiles.com/ugd/b8c837_f07c65a23bd341119e646d37fcfb6133.pdf
    • https://static.usrfiles.com/ugd/b8c837_eb335737a47b4a68aba77d7ba136fa2a.pdf
    • https://static.usrfiles.com/ugd/b8c837_85196644eabb4488bdd8950c3fdd374f.pdf
    • https://cdn.shopify.com/s/files/1/0431/0705/7825/files/gozatanisuxetitabobanodot.pdf
    • https://cdn.shopify.com/s/files/1/0427/7121/8588/files/79269190201.pdf
    • https://cdn.shopify.com/s/files/1/0427/5775/0951/files/68427783059.pdf
    • https://cdn.shopify.com/s/files/1/0431/4628/1122/files/48307398493.pdf
    • https://cdn.shopify.com/s/files/1/0432/4923/8178/files/integrated_math_1_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0428/7981/1750/files/2170817957.pdf
    • https://cdn.shopify.com/s/files/1/0447/5843/3943/files/lateral_epicondylitis_spanish.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000060e5.bin
2dbf49f289c5c677a36ddaed9d897798cf9e132ea91a75b296549dcb1eaf5a81		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60E5 5168 bytes
font_01_sfnt_off0000727f.bin
d4ad3ccaa02d7c18b9b5e8abea60bd66feaca3ab06ba08cce826bd27f7b7d430		 pdf-font-stream PDF embedded font (sfnt) at offset 0x727F 9984 bytes

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