Malicious PDF — malware analysis report

Static analysis result for SHA-256 b541df77e074f075…

MALICIOUS

PDF

44.5 KB Created: 2020-08-12 09:43:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 58399c8f07d359889fb4a47e86bbd4b9 SHA-1: fad2fa3fefd5ec57226e35ce80fd0cb5b2add260 SHA-256: b541df77e074f075b1a0314b96305bb3a797986c30df085119a9f305aafa129b
120 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to what appears to be a link farm hosted on cdn.shopify.com. One critical heuristic firing indicates that the PDF links to known malicious redirector infrastructure via 'ttraff.cc'. The document body, though partially corrupted, contains text related to PDF annotations and the authoring application 'wkhtmltopdf', suggesting a deliberate attempt to disguise the malicious nature of the 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.cc/pify?keyword=define+annotation+pdf
    • http://files.sirjohncassprimary.org/uploads/1/3/2/7/132741322/2533994.pdf
    • http://files.rainadance.com/uploads/1/3/0/7/130775679/8846183.pdf
    • http://files.kathysnow.ca/uploads/1/3/0/9/130969254/7718378.pdf
    • http://files.stpetersindy.org/uploads/1/3/1/3/131380063/aa5daeec.pdf
    • https://cdn.shopify.com/s/files/1/0447/8337/0397/files/suwagoroxog.pdf
    • https://cdn.shopify.com/s/files/1/0435/4323/2661/files/furoxabepe.pdf
    • https://cdn.shopify.com/s/files/1/0431/1659/3312/files/lubuvijaxefupibofad.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/57955619809.pdf
    • https://cdn.shopify.com/s/files/1/0434/6091/9462/files/94690600180.pdf
    • https://cdn.shopify.com/s/files/1/0432/9819/3566/files/24204709819.pdf
    • https://cdn.shopify.com/s/files/1/0434/0786/8060/files/kerberos_network_authentication_protocol.pdf
    • https://cdn.shopify.com/s/files/1/0452/1204/1367/files/bee_gees_how_deep_is_your_love_chords.pdf
    • https://cdn.shopify.com/s/files/1/0428/0742/7238/files/tabimewazosiwekujow.pdf
    • https://cdn.shopify.com/s/files/1/0432/5533/3027/files/fuliwiwujolazofifikegoxuv.pdf
    • https://cdn.shopify.com/s/files/1/0432/2839/7732/files/atos_e_contratos_administrativos.pdf
    • https://cdn.shopify.com/s/files/1/0440/4389/4934/files/42026845478.pdf
    • https://cdn.shopify.com/s/files/1/0436/4576/3744/files/kupuwavulo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/sabam.pdf
    • https://cdn.shopify.com/s/files/1/0439/2674/9339/files/dixizobigilozodekifojejam.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/
    • https://cdn.shopify.com/s/files/1/0439/2674/9339/files/dixizobigilozodekifo

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006c0f.bin
4957c26e75fe0265340547e3c375bdc43823aa771fc30f93604a8e6559b26656
pdf-font-stream PDF embedded font (sfnt) at offset 0x6C0F 4728 bytes
font_01_sfnt_off00007c42.bin
ec9881b95dbad1a66ab5cb48599f6250f3217dd141dd5f2cc868a8e1786086e7
pdf-font-stream PDF embedded font (sfnt) at offset 0x7C42 12216 bytes