Malicious PDF — malware analysis report

Static analysis result for SHA-256 4274cc59103cf8b9…

MALICIOUS

PDF

62.6 KB Created: 2020-08-31 03:01:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7c1e243b7312708c0d5fca83ff0c0e24 SHA-1: 258c5eb90808bae19a3f9b46156f8e557b218705 SHA-256: 4274cc59103cf8b923c28dbf971de7671adf49a9ccdf701c91e138ef7d3d81a4
120 Risk Score

Malware Insights

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

The PDF file contains embedded links, one of which points to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'chocolate' and 'hormones' which is likely a lure to entice users to click the malicious link. The presence of numerous external PDF links, many hosted on static.usrfiles.com, suggests a link farm or SEO poisoning tactic to distribute the malicious content. No scripts were extracted, but the primary attack vector appears to be social engineering via deceptive links.

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.ru/wix?keyword=o+chocolate+estimula+a+produ%25C3%25A7%25C3%25A3o+do+horm%25C3%25B4nio+2-feniletilamina
    • https://static.usrfiles.com/ugd/b8c837_28410656406e4946852adc44fe522506.pdf
    • https://static.usrfiles.com/ugd/822ecd_2ed9925e08ef43fb89b4d234e2e6ce56.pdf
    • https://static.usrfiles.com/ugd/b8c837_1516538660044be79637c72da6bec997.pdf
    • https://static.usrfiles.com/ugd/7baf93_138183f4b15a4ca69c4303c4729dd64d.pdf
    • https://static.usrfiles.com/ugd/a48928_d428db8ebf794428ad3c957a20aa5a56.pdf
    • https://static.usrfiles.com/ugd/67f5f7_3e1b6952a2da4ec4b9225f4a7799dc68.pdf
    • https://static.usrfiles.com/ugd/b8c837_6036cc89274c413e81a0200965828b88.pdf
    • https://cdn.shopify.com/s/files/1/0437/9449/7698/files/child_care_regulations_2020.pdf
    • https://cdn.shopify.com/s/files/1/0431/7259/3832/files/kusaxasamotesigoguburiruw.pdf
    • https://cdn.shopify.com/s/files/1/0460/6561/5003/files/gary_francisco_mariscal_herrera.pdf
    • https://cdn.shopify.com/s/files/1/0439/5394/6782/files/kerboodle_answers_chemistry_9-_1.pdf
    • https://cdn.shopify.com/s/files/1/0435/2750/4024/files/vajubexereriferavuxiriwap.pdf
    • https://cdn.shopify.com/s/files/1/0440/1525/5710/files/dexefumunonepisatotedaz.pdf
    • https://cdn.shopify.com/s/files/1/0433/9109/0844/files/tolokotikaw.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_off0000a006.bin
6435fc191ebc38e881df1ca8ecc095919b73462573e702801a286c4c05f9da51
pdf-font-stream PDF embedded font (sfnt) at offset 0xA006 3028 bytes
font_01_sfnt_off0000aae2.bin
0ec6e8c319a27720e16f2ba1ab286435b8d37b0e21453b9410ac662a1becd69e
pdf-font-stream PDF embedded font (sfnt) at offset 0xAAE2 6228 bytes
font_02_sfnt_off0000bee3.bin
bec7f0e8d7369a97967207022b4fc18e1be26753cba3dd0a3333da67e27fbdd8
pdf-font-stream PDF embedded font (sfnt) at offset 0xBEE3 14772 bytes