Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcf194d6d6820a34…

MALICIOUS

PDF

41.5 KB Created: 2020-08-03 19:58:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b04eacfd7cf63110b1a6e61cc4ca646f SHA-1: 6b99e8df521cabff3ae80e04133ddbe9af0b742b SHA-256: dcf194d6d6820a3480bf7c0360183f442d54f98a146233a21a819798043187d2
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a link farm and a malicious redirector disguised as a 'Briggs and Stratton engine manual PDF'. The primary malicious link, https://ttraff.cc/pify?keyword=briggs+and+stratton+engine+manual+pdf, redirects to further infrastructure. The document body is heavily obfuscated but contains references to the lure and the malicious URL. The ML classifier strongly indicates 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.cc/pify?keyword=briggs+and+stratton+engine+manual+pdf
    • http://files.makeyourownlipstick.com/uploads/1/3/1/3/131384098/ritexosigizuzasewif.pdf
    • http://files.susannaclasby.com/uploads/1/3/0/7/130775027/b39e6192385a29.pdf
    • http://files.colinsroom.net/uploads/1/3/1/4/131438299/foloxuluw.pdf
    • http://kuxetig.luckypennyrealty.com/uploads/1/3/1/4/131452883/solawiwanebisezasave.pdf
    • http://files.marcierappahomes.com/uploads/1/3/0/8/130873741/sufonax.pdf
    • https://cdn.shopify.com/s/files/1/0432/7122/5494/files/zezimumive.pdf
    • https://cdn.shopify.com/s/files/1/0434/2313/7957/files/99041938629.pdf
    • https://cdn.shopify.com/s/files/1/0427/4470/9276/files/58527551993.pdf
    • https://cdn.shopify.com/s/files/1/0432/0133/1360/files/67484181753.pdf
    • https://cdn.shopify.com/s/files/1/0433/7133/1742/files/49619637305.pdf
    • https://cdn.shopify.com/s/files/1/0430/6518/0314/files/38799286802.pdf
    • https://cdn.shopify.com/s/files/1/0434/3827/6760/files/30029723598.pdf
    • https://cdn.shopify.com/s/files/1/0435/1537/9866/files/daxenejojijofodakux.pdf
    • https://cdn.shopify.com/s/files/1/0428/2381/1239/files/filukobuj.pdf
    • https://cdn.shopify.com/s/files/1/0436/9108/1882/files/pepusuwenamakozujojada.pdf
    • https://cdn.shopify.com/s/files/1/0430/4646/9793/files/fumotuzemosovig.pdf
    • https://cdn.shopify.com/s/files/1/0432/1925/5454/files/62661331590.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_off0000639d.bin
3ee864065b2455c6c1d6e413d688cd6df30384020ec71fb7db4f5440f8725b08		 pdf-font-stream PDF embedded font (sfnt) at offset 0x639D 5408 bytes
font_01_sfnt_off000075ef.bin
8a58c7e501b7710327952a3b1afdc391ae7d77b8f5bda9c7b6a25f8f38531e58		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75EF 10212 bytes

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