Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b74a1e31b695e83…

MALICIOUS

PDF

35.2 KB Created: 2020-08-30 08:07:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b55eb6377570bb74cdc53c650a9f0261 SHA-1: 2acd113c432f5508917b34b868fd53f0986c73e9 SHA-256: 8b74a1e31b695e839250591c670c9d54832c9c65a14eae2609a3918a1cd0ab65
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, specifically `https://ttraff.com/wix?keyword=doxology+piano+tutorial`. This link is likely part of a phishing or social engineering attempt to lure users to a malicious site. The document also exhibits characteristics of a link farm, with numerous embedded links to other PDFs, suggesting an attempt to manipulate search engine results or distribute content through a large number of seemingly benign links. The ML classifier strongly supports the malicious verdict.

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.com/wix?keyword=doxology+piano+tutorial
    • https://cdn.shopify.com/s/files/1/0435/0597/5462/files/ayatul_kursi_in_arabic_and_english.pdf
    • https://cdn.shopify.com/s/files/1/0441/2869/8520/files/proxy_voting_form_template_uk.pdf
    • https://cdn.shopify.com/s/files/1/0430/9732/5732/files/runescape_malformed_login_packet.pdf
    • https://cdn.shopify.com/s/files/1/0438/7130/5896/files/vinimemuneratekajegip.pdf
    • https://static.usrfiles.com/ugd/3cb679_47ef0e18e5874c7991f25a94c3327538.pdf
    • https://static.usrfiles.com/ugd/299074_073ccad755e34f678ce35a3d3b99fe39.pdf
    • https://static.usrfiles.com/ugd/b8c837_9e964f10dfb44093a9bb5e92cf1760f9.pdf
    • https://static.usrfiles.com/ugd/b8c837_45a7289066404131857ee4b4a092155d.pdf
    • https://cdn.shopify.com/s/files/1/0429/8086/8255/files/zejukefazazuzizoxow.pdf
    • https://cdn.shopify.com/s/files/1/0435/5935/4517/files/vadux.pdf
    • https://cdn.shopify.com/s/files/1/0429/1880/5657/files/dunulujiz.pdf
    • https://cdn.shopify.com/s/files/1/0430/8788/8535/files/fixinosev.pdf
    • https://cdn.shopify.com/s/files/1/0427/6197/8023/files/test_de_raven.pdf
    • https://cdn.shopify.com/s/files/1/0433/4741/1096/files/galafuze.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_off00004b77.bin
5f37239e387cd5ee54380a08636bef73dc3e501b3e43644be5356637777ba6fa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4B77 4976 bytes
font_01_sfnt_off00005c81.bin
22703c303a7509b49da5a411c18f4d7c279cc810d1386e355c5a11089dd7e016		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C81 10044 bytes

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