Malicious PDF — malware analysis report

Static analysis result for SHA-256 efbfafe13a767595…

MALICIOUS

PDF

40.6 KB Created: 2020-08-15 07:17:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bfe28b9b97f7870bbbe36e8f112801ac SHA-1: 209f13cb473f1ccd7eb68cf0b7faf92324206d6d SHA-256: efbfafe13a7675959a7f7dc7b06f7e4740bb235328426c7813d81ae5c9514abc
150 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, which is also present in the document body. This link, 'https://ttraff.ru/pify?keyword=black+bear+mask+template+printable', is designed to lure users into clicking it under the guise of a printable template. The PDF also contains a large number of external links, many pointing to Shopify, which is indicative of a link farm used for SEO poisoning or traffic redirection. The ML classifier strongly supports the malicious nature of this PDF.

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=black+bear+mask+template+printable
    • http://foduxow.hotchocolatedispensers.com/uploads/1/3/2/3/132302780/27da255.pdf
    • http://files.anarchydieseltuning.net/uploads/1/3/1/3/131382595/tomuk-jidaw-sisudagurofa-luvelag.pdf
    • http://files.sealevelbakery.com/uploads/1/3/2/7/132710784/599640.pdf
    • http://fopus.boynecityhardware.com/uploads/1/3/0/7/130776485/goxavoteribeguwonum.pdf
    • https://cdn.shopify.com/s/files/1/0436/6788/2134/files/27920844248.pdf
    • https://cdn.shopify.com/s/files/1/0429/9223/8745/files/canon_eos_40d_manual.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/sefumiwizekoreletete.pdf
    • https://cdn.shopify.com/s/files/1/0432/7079/9510/files/duvegofokamituveb.pdf
    • https://cdn.shopify.com/s/files/1/0437/2260/4695/files/tesosaw.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/13578549785.pdf
    • https://cdn.shopify.com/s/files/1/0432/3606/5438/files/reading_worksheets_esl.pdf
    • https://cdn.shopify.com/s/files/1/0429/5000/0791/files/64537677342.pdf
    • https://cdn.shopify.com/s/files/1/0431/5742/2229/files/delimuke.pdf
    • https://cdn.shopify.com/s/files/1/0431/9562/9725/files/kukolajeximepiludej.pdf
    • https://cdn.shopify.com/s/files/1/0435/1475/7288/files/payment_request_form_gmu.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/1/0431/9562/9

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006020.bin
b11e2b3815dbce8563fcc4d57861af3224c358ff6ff34879388d3be8dbaf0aab
pdf-font-stream PDF embedded font (sfnt) at offset 0x6020 5332 bytes
font_01_sfnt_off00007224.bin
248f48c5cabe60d7e6e83417bb8de4b5ab0b0e71ee40446e1a7b7171a293004c
pdf-font-stream PDF embedded font (sfnt) at offset 0x7224 10260 bytes