Malicious PDF — malware analysis report

Static analysis result for SHA-256 b71ddea0b3df2d67…

MALICIOUS

PDF

40.2 KB Created: 2020-08-31 18:15:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 99ba61582397be3bd7e31b1b0a0a8e51 SHA-1: e3eb46327ff0cdbf59444dc9202cd5b4168773ed SHA-256: b71ddea0b3df2d678e65f3933e9ba4e63fe0c2c19cac68507be37ed2057d417a
150 Risk Score

Malware Insights

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

The PDF file contains a high number of embedded links, many of which point to a redirector service. The primary malicious URL identified is ttraff.ru, which is flagged as a malicious redirector. The document body, though heavily obfuscated, contains references to the malicious URL and a large number of other PDF links, suggesting a link farm or SEO poisoning tactic. The ML classifier also strongly indicated maliciousness.

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.ru/pify?keyword=alone+happy+images+free
    • https://static.usrfiles.com/ugd/09c3c7_96107affdda94ae5a7e2aa0acd005010.pdf
    • https://static.usrfiles.com/ugd/e8506d_6f4f375cf17c42749853dc71717f6a49.pdf
    • https://static.usrfiles.com/ugd/3f80ec_8741f2692a2f41d8a2fe75ac4ee2b1bb.pdf
    • https://static.usrfiles.com/ugd/b8c837_60aaee2e208e4dbaaa5c02bb66bc77a7.pdf
    • https://static.usrfiles.com/ugd/9374a7_6ea93185523549d496110c8f29a92e74.pdf
    • https://cdn.shopify.com/s/files/1/0437/6369/5770/files/58935813427.pdf
    • https://cdn.shopify.com/s/files/1/0435/0102/7493/files/zesanerevusalixemovesumap.pdf
    • https://cdn.shopify.com/s/files/1/0440/8141/4296/files/benim.pdf
    • https://cdn.shopify.com/s/files/1/0437/9839/7085/files/dajupikazabasul.pdf
    • https://cdn.shopify.com/s/files/1/0435/5201/4491/files/assemble_computer_hardware_pdf.pdf
    • https://static.usrfiles.com/ugd/0dcf4b_9bd19c2be5a44eed85c60f9fa58a7119.pdf
    • https://static.usrfiles.com/ugd/49be48_b8bd25c319404ae9870e38b0057c3f57.pdf
    • https://static.usrfiles.com/ugd/9b5f63_5308a00a35cd4c89b3a6e84656528355.pdf
    • https://cdn.shopify.com/s/files/1/0436/0726/1341/files/briggs_and_stratton_l_head_repair_manual.pdf
    • https://cdn.shopify.com/s/files/1/0433/7300/2902/files/kupeteloraw.pdf
    • https://cdn.shopify.com/s/files/1/0432/9085/3541/files/80891837090.pdf
    • https://cdn.shopify.com/s/files/1/0432/4917/2635/files/73030284086.pdf
    • https://cdn.shopify.com/s/files/1/0428/2351/6323/files/zideremoboboriv.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_off00004a10.bin
b483ce185e8ce20e849faeb3856ddae82669246fe60739b979bfa7a99504224f
pdf-font-stream PDF embedded font (sfnt) at offset 0x4A10 5408 bytes
font_01_sfnt_off00005c58.bin
b7740141df7dbc9a9e3f3be8f426e12334a396b6f440648004e5d93d3953a6b2
pdf-font-stream PDF embedded font (sfnt) at offset 0x5C58 9904 bytes
font_02_sfnt_off00007e48.bin
f469c5aa689aa4c1965481b78cfaebbf1c3ebdad2306c7067134b7b4aaa0addd
pdf-font-stream PDF embedded font (sfnt) at offset 0x7E48 16164 bytes