Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ab90f28e32423f9…

MALICIOUS

PDF

50.6 KB Created: 2020-09-04 16:15:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9df533b432501fed8272bffcd16b86ff SHA-1: 40cf12a5fe592cc1c100f78de4279eb7b2a29fa4 SHA-256: 1ab90f28e32423f9d06d6b673f0bf1d36732ee438b02675af5086eca65cf4b87
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, which is the primary attack vector. The document body, though heavily obfuscated, contains text related to financial statements and a URL that mirrors the malicious redirector. The presence of numerous external PDF links, many pointing to benign content on Shopify, suggests a link farm or SEO poisoning tactic to mask the malicious redirector. No scripts were extracted from this sample.

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.link/wix?keyword=projected+balance+sheet+format+for+proprietor
    • https://cdn.shopify.com/s/files/1/0437/5507/7786/files/accounting_equation_problems_and_solutions.pdf
    • https://cdn.shopify.com/s/files/1/0434/1553/5774/files/golijedetujidapibufud.pdf
    • https://cdn.shopify.com/s/files/1/0428/2079/6583/files/31011216227.pdf
    • https://cdn.shopify.com/s/files/1/0432/0156/0737/files/17977508911.pdf
    • https://cdn.shopify.com/s/files/1/0438/4774/5698/files/63345953563.pdf
    • https://cdn.shopify.com/s/files/1/0433/1926/3397/files/apache_jmeter_3._3_free.pdf
    • https://cdn.shopify.com/s/files/1/0430/8788/8535/files/wilezuxazuredepimibategif.pdf
    • https://cdn.shopify.com/s/files/1/0431/2802/9345/files/75676653148.pdf
    • https://cdn.shopify.com/s/files/1/0432/4445/4056/files/cie_o_level_biology_notes.pdf
    • https://cdn.shopify.com/s/files/1/0430/9506/4730/files/organ_systems_of_the_human_body_and_their_functions.pdf
    • https://cdn.shopify.com/s/files/1/0428/5412/1635/files/bojonufuxujivo.pdf
    • https://static.usrfiles.com/ugd/a1fb72_eefe9f8fc5dc4e398cd92789d13d46eb.pdf
    • https://static.usrfiles.com/ugd/9c58c5_1eaf578fef8f40fa8dc46d41199f56ef.pdf
    • https://static.usrfiles.com/ugd/c1c462_53bda01ff9ff4f5d8b190f32205dfdfe.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_off00007d02.bin
dd7b880f1c6958317b71933e3175eb4154b1281d355b69180e4ce829e506ee21
pdf-font-stream PDF embedded font (sfnt) at offset 0x7D02 2828 bytes
font_01_sfnt_off000086fc.bin
64668497b8016b11307afb8c68e0d3c026c6a0671ab31d8df0cee3014ed3eaf5
pdf-font-stream PDF embedded font (sfnt) at offset 0x86FC 5612 bytes
font_02_sfnt_off000099e1.bin
5b0799fd8f83136658e86d0a6a9e7f931f66ad65acbc225694b4fc75579a4dce
pdf-font-stream PDF embedded font (sfnt) at offset 0x99E1 10328 bytes