Malicious PDF — malware analysis report

Static analysis result for SHA-256 33ccb6da088bca28…

MALICIOUS

PDF

38.1 KB Created: 2020-09-01 06:42:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b2fd21c9856719e73942b8a9157032a3 SHA-1: 2ce69d6896e1dc3234f1c90d0e55f20550108900 SHA-256: 33ccb6da088bca28addf7d1b471537294603a26e1873b1a19eea7c4f4f901cd9
150 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.cc/wix?keyword=coursera+machine+learning+course+answers'. This link is presented within the document body, disguised as answers to a Coursera machine learning course. The file also exhibits characteristics of a link farm, with numerous embedded URLs, many hosted on cdn.shopify.com. The primary intent appears to be directing users to malicious infrastructure through a deceptive lure.

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=coursera+machine+learning+course+answers
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/16481260084.pdf
    • https://cdn.shopify.com/s/files/1/0430/2841/4618/files/lumuma.pdf
    • https://cdn.shopify.com/s/files/1/0434/0157/6602/files/cycle_of_abuse_domestic_violence.pdf
    • https://cdn.shopify.com/s/files/1/0435/5712/6295/files/68337658171.pdf
    • https://static.usrfiles.com/ugd/b8c837_301c36b947394c2687d7119b95287eb0.pdf
    • https://static.usrfiles.com/ugd/912de2_1ab646f7609c4d5c999ec2a0c8d21a54.pdf
    • https://static.usrfiles.com/ugd/b8c837_ad908162b8fe44ed80bf2d3668d8be69.pdf
    • https://cdn.shopify.com/s/files/1/0430/8120/3861/files/mumobawunuz.pdf
    • https://cdn.shopify.com/s/files/1/0435/4444/5092/files/jedujiserisujewatagi.pdf
    • https://cdn.shopify.com/s/files/1/0441/1280/6040/files/wedawejaxuke.pdf
    • https://static.usrfiles.com/ugd/eaf48f_f2fbf9cd1273472690a14f14aa760e9a.pdf
    • https://static.usrfiles.com/ugd/d902bb_8658e1453f6c418499ee3e400680d425.pdf
    • https://static.usrfiles.com/ugd/b8c837_b9cb98e7aaa244ebb303e8d3e69481bb.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_off0000570c.bin
7707d2a7778d52002c31e1e4896e70c84a6003a5fb8265e4c4c5e754f54aadde		 pdf-font-stream PDF embedded font (sfnt) at offset 0x570C 5212 bytes
font_01_sfnt_off000068a3.bin
6636c9ee3a6f403241cd176e58606637af5f4118c3ca370b6b79b2f7104c69bf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68A3 10304 bytes

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