Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8b8a237b4687e37…

MALICIOUS

PDF

45.6 KB Created: 2020-08-11 05:33:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 548cba101b5dd0473d4f3839c08a149a SHA-1: 28962d86458996a1c87877d5b965a02d86dd1fe3 SHA-256: f8b8a237b4687e37ae41e11e32329b1285ce969c1d774f3e4cfc01597bb59aa1
120 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/pify?keyword=aqa+a+level+biology+specification+pdf'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded links, many of which point to Shopify domains hosting PDF files. The document body, though heavily obfuscated, contains text related to 'Aqa a level biology specification pdf' and the wkhtmltopdf tool, suggesting a lure to disguise the malicious intent. The primary malicious IOC is the redirector URL, which is likely used to funnel victims to further malicious content.

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/pify?keyword=aqa+a+level+biology+specification+pdf
    • http://files.vielka.com/uploads/1/3/0/7/130776111/3445326.pdf
    • http://gizuk.globalvillagetravels.com/uploads/1/3/0/7/130775677/636564.pdf
    • http://files.austinteenhotspot.com/uploads/1/3/1/0/131070212/nafigizumen.pdf
    • https://cdn.shopify.com/s/files/1/0431/5591/4918/files/business_name_registration_form_kenya.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/bivunamu.pdf
    • https://cdn.shopify.com/s/files/1/0434/7301/0850/files/zomagipizipasakofoso.pdf
    • https://cdn.shopify.com/s/files/1/0428/9236/1887/files/12221233920.pdf
    • https://cdn.shopify.com/s/files/1/0437/8922/2037/files/zetidamatijixefif.pdf
    • https://cdn.shopify.com/s/files/1/0433/0536/9758/files/82473039466.pdf
    • https://cdn.shopify.com/s/files/1/0433/4977/0408/files/29233575338.pdf
    • https://cdn.shopify.com/s/files/1/0433/1972/2152/files/guwatotebazarinarori.pdf
    • https://cdn.shopify.com/s/files/1/0432/4065/2960/files/types_of_brainstorming_methods.pdf
    • https://cdn.shopify.com/s/files/1/0433/8620/8406/files/autocad_3d_free.pdf
    • https://cdn.shopify.com/s/files/1/0433/7316/6744/files/lawilevujuvularijoruxen.pdf
    • https://cdn.shopify.com/s/files/1/0432/5110/5947/files/nesikig.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_off000064d9.bin
12d00b78cb6cc7a386c221e78e0341122bc4bf5863bc15d8326aa91fe41826f3
pdf-font-stream PDF embedded font (sfnt) at offset 0x64D9 5432 bytes
font_01_sfnt_off00007765.bin
c69640524cc209d70c28d5a68be8dfdb094bc0d5549a1c1c438a6962e77d91d8
pdf-font-stream PDF embedded font (sfnt) at offset 0x7765 10404 bytes
font_02_sfnt_off00009af5.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176
pdf-font-stream PDF embedded font (sfnt) at offset 0x9AF5 4324 bytes