Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc4a5d1dcd416390…

MALICIOUS

PDF

41.3 KB Created: 2020-08-07 19:57:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 004544dca9e43d5b8ebcb7f9c37a4de4 SHA-1: 71df077f6e4680131652bd2650be8869edcf2756 SHA-256: bc4a5d1dcd4163905020866782270c6bcb7dd2784f1ee2eb26c99850f3682a59
150 Risk Score

Malware Insights

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

The PDF contains a high number of embedded links, with a critical heuristic firing for a malicious redirector. The primary malicious URL identified is ttraff.com, which is used in conjunction with a seemingly benign PDF title to lure the user. The ML classifier also strongly indicated 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.com/pify?keyword=argentometric+method+pdf
    • http://lezeka.lifecoachkoreen.com/uploads/1/3/1/6/131606490/wapiwebozuwa.pdf
    • http://files.gemmabellydancer.co.uk/uploads/1/3/1/1/131164033/fcac80.pdf
    • http://files.cellobob.com/uploads/1/3/2/6/132681460/xozafavubuv_lekepamokirufi_gozuv.pdf
    • http://files.grafixwizard.com/uploads/1/3/1/3/131380558/memunosotilevafe.pdf
    • http://files.cheadlesigns.com/uploads/1/3/1/4/131437504/6c9fc464d.pdf
    • https://cdn.shopify.com/s/files/1/0433/3525/4171/files/63620650627.pdf
    • https://cdn.shopify.com/s/files/1/0431/1800/2340/files/porixojatagewesag.pdf
    • https://cdn.shopify.com/s/files/1/0429/7955/7539/files/kerutikabogi.pdf
    • https://cdn.shopify.com/s/files/1/0429/6353/3977/files/92577758267.pdf
    • https://cdn.shopify.com/s/files/1/0435/7747/5233/files/acca_f3_notes._download.pdf
    • https://cdn.shopify.com/s/files/1/0433/6726/8517/files/42602345280.pdf
    • https://cdn.shopify.com/s/files/1/0437/6775/8999/files/30216997645.pdf
    • https://cdn.shopify.com/s/files/1/0431/5627/5360/files/sewebumerupuvefitemogun.pdf
    • https://cdn.shopify.com/s/files/1/0432/7096/3366/files/zilofosakujiwiwun.pdf
    • https://cdn.shopify.com/s/files/1/0431/1423/4017/files/31989180196.pdf
    • https://cdn.shopify.com/s/files/1/0430/1144/0803/files/25012128044.pdf
    • https://cdn.shopify.com/s/files/1/0432/5769/2320/files/kukirepegovutuduzatexuvij.pdf
    • https://cdn.shopify.com/s/files/1/0431/6987/4082/files/sirux.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_off000064f3.bin
b20cda7d505ba2cc110589c3000c1db1b0801742f4c7cfe3c8ca0af4462fc015		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64F3 5140 bytes
font_01_sfnt_off00007650.bin
eb57f8373b17040c4c98654b744e08e85e0041d9c5ad18e544044be233db1157		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7650 10044 bytes

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