Malicious PDF — malware analysis report

Static analysis result for SHA-256 b738cb720c0d79ab…

MALICIOUS

PDF

49.1 KB Created: 2020-08-31 06:22:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fcc46790ed687d497e2e82d6470e2583 SHA-1: e40df60b84f09b99d659ed2a10dc613865fc5e3a SHA-256: b738cb720c0d79abd74a691e25c1765a296dee92c25db03d8f090f10453b4571
128 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for a malicious redirector link, which points to a URL designed to lure users with a search keyword. The document body, though heavily obfuscated, contains this URL and appears to be a link farm, with many embedded URLs pointing to various PDF files. The presence of a 'download button' heuristic further supports the lure-based attack pattern. The primary malicious IOC is the redirector URL.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/wix?keyword=canon+color+imageclass+mf726cdw+manual
    • https://static.usrfiles.com/ugd/44b221_055d203dcfab473888b7732e57cdb45a.pdf
    • https://static.usrfiles.com/ugd/eed56f_7f38dd7258884d2b88ae1786b1fba821.pdf
    • https://static.usrfiles.com/ugd/b8c837_2d6608b009dd43d7ad134d5df9a149a7.pdf
    • https://static.usrfiles.com/ugd/764aaa_6d011d78e8794237b8acd112446d5b27.pdf
    • https://static.usrfiles.com/ugd/7baf93_30182ae7a7e843048fc50da78fa3eb7e.pdf
    • https://cdn.shopify.com/s/files/1/0433/9603/8812/files/86770169517.pdf
    • https://cdn.shopify.com/s/files/1/0434/8113/7316/files/medezup.pdf
    • https://cdn.shopify.com/s/files/1/0438/2159/6834/files/96059651549.pdf
    • https://cdn.shopify.com/s/files/1/0434/5584/0409/files/34365967817.pdf
    • https://cdn.shopify.com/s/files/1/0433/2670/1726/files/39664515323.pdf
    • https://static.usrfiles.com/ugd/136d07_596aa9fced7a44fa83bd261cb1c52121.pdf
    • https://static.usrfiles.com/ugd/b8c837_c5930ba9077549a3acf0e01332163243.pdf
    • https://cdn.shopify.com/s/files/1/0432/3396/8287/files/98808070909.pdf
    • https://cdn.shopify.com/s/files/1/0430/7176/6695/files/gimamesediriniwi.pdf
    • https://cdn.shopify.com/s/files/1/0437/1582/1717/files/australian_english_dictionary_free.pdf
    • https://cdn.shopify.com/s/files/1/0430/9463/8749/files/11653708202.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_off00008124.bin
06e41a4a8a127e060a2171c9551e7090f09fc8151fedddc807bec6a5b28d3660
pdf-font-stream PDF embedded font (sfnt) at offset 0x8124 5704 bytes
font_01_sfnt_off00009495.bin
0d58f0eb00bcad0d59c90ddaff9e2f8e5c7b8bac99059474a447c32f8ea0d67f
pdf-font-stream PDF embedded font (sfnt) at offset 0x9495 10200 bytes