Malicious PDF — malware analysis report

Static analysis result for SHA-256 d797372e2f7914cc…

MALICIOUS

PDF

33.5 KB Created: 2020-08-29 12:08:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a3c5762ca96044c0dae52da038e2b53d SHA-1: fffff767f51002098bfca95581646725fc0cbd57 SHA-256: d797372e2f7914ccea0fbe3d29ffb4928a2674a9efd8bac99729914e0052f699
150 Risk Score

Malware Insights

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

The PDF file was flagged by multiple critical heuristics for containing malicious redirector links and a large link farm. The ML classifier also strongly indicated maliciousness. The embedded links, particularly the one to 'ttraff.com', suggest an attempt to lure users to malicious infrastructure. No scripts were extracted, but the sheer volume of links points to a content-based attack pattern.

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=psi+cch+vallejo
    • https://static.usrfiles.com/ugd/b8c837_508eca07613e405485a54498daf816ec.pdf
    • https://static.usrfiles.com/ugd/b8c837_a84918c81c784b88a640d33f38f09a31.pdf
    • https://static.usrfiles.com/ugd/b8c837_e303e836fcfc4286a25534a1be6a9e77.pdf
    • https://static.usrfiles.com/ugd/b8c837_1e0f500d713148e38461148786b0980f.pdf
    • https://static.usrfiles.com/ugd/b8c837_fafeba85272149c8a146bdad6c8026ef.pdf
    • https://static.usrfiles.com/ugd/b8c837_244d449de36748219209c18fe6f106a7.pdf
    • https://cdn.shopify.com/s/files/1/0436/5756/0217/files/37891173500.pdf
    • https://cdn.shopify.com/s/files/1/0433/2394/9224/files/14165313694.pdf
    • https://cdn.shopify.com/s/files/1/0463/0455/9261/files/xarise.pdf
    • https://cdn.shopify.com/s/files/1/0460/3284/7012/files/62104234764.pdf
    • https://cdn.shopify.com/s/files/1/0432/1083/4077/files/povemugekizujegero.pdf
    • https://cdn.shopify.com/s/files/1/0433/3781/0075/files/zafenidoradapurujajibexe.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_off000045ef.bin
9736ea24fb8e3ee7c8b3fd1ca2066e3b4641e515342e5cc5278b838339ab377c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x45EF 4928 bytes
font_01_sfnt_off000056af.bin
011a09385ae6ad23f0eddb11dbb9b820b04ad6a192d2c45beff1eb1bbfb06b1b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x56AF 10316 bytes

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