Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b935ccd0a911d65…

MALICIOUS

PDF

40.6 KB Created: 2020-08-20 21:06:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b4effc39167d98f8e54c0d2ff89636f9 SHA-1: 0da28aa7e0de365afdec29bfa932e270c9541c22 SHA-256: 7b935ccd0a911d6512e45a661c89f25d899ad9d38e7acfd1ac32b35d9c2f4c0f
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, pointing to 'https://ttraff.cc/pify?keyword=acrylic+sheets+brisbane+australia'. This indicates the document's primary purpose is to redirect users to malicious infrastructure. The PDF also exhibits characteristics of a link farm, with numerous embedded URLs, some of which are benign Shopify links, but the presence of the malicious redirector is the highest priority IOC. 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.cc/pify?keyword=acrylic+sheets+brisbane+australia
    • http://files.burbankbeat.net/uploads/1/3/1/0/131070313/8699330.pdf
    • https://cdn.shopify.com/s/files/1/0434/5567/6580/files/nuevo_acuerdo_de_paz.pdf
    • https://cdn.shopify.com/s/files/1/0438/7205/9547/files/aura_sync_asus.pdf
    • https://cdn.shopify.com/s/files/1/0440/2675/7270/files/76245656105.pdf
    • https://cdn.shopify.com/s/files/1/0440/6290/0374/files/ffxi_official_forums.pdf
    • https://cdn.shopify.com/s/files/1/0434/5780/6486/files/zoleberi.pdf
    • https://cdn.shopify.com/s/files/1/0436/3167/3502/files/sowivumixop.pdf
    • https://cdn.shopify.com/s/files/1/0429/0455/1590/files/understanding_the_linux_kernel_bovet.pdf
    • https://cdn.shopify.com/s/files/1/0431/1249/7313/files/android_auto_music_apps_not_showing.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000056a6.bin
7a3bfd1e01a3c916093c42721328c14147967c01124f54fd41ffa7c422347ad3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x56A6 5120 bytes
font_01_sfnt_off00006805.bin
a1fa27738b2d72fc7a939a8584fe33da5b2d51371aa6e952892aa222c8193315		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6805 14392 bytes

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