Malicious PDF — malware analysis report

Static analysis result for SHA-256 da283f458820498f…

MALICIOUS

PDF

59.6 KB Created: 2020-08-18 15:46:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a4f33112e19acaa6a190df1ef3f180b3 SHA-1: d0b05c9d4ed35ab17cbc9b5f4ff02edf9ec80b4c SHA-256: da283f458820498f508ebbb5bd4dd79e78ee8f469dbc6d3d135fea7d82c93f0f
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector. The document body, though heavily obfuscated, contains the URL for the redirector, suggesting the document's primary purpose is to drive traffic to malicious infrastructure. 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.cc/pify?keyword=precalculus+inverse+trig+functions+worksheet
    • http://lozubad.caringhomehealth.net/uploads/1/3/0/8/130873995/pepapo.pdf
    • http://files.vcgallery.org/uploads/1/3/1/8/131856381/rokererukirejakifu.pdf
    • http://files.a-pamperedpooch.com/uploads/1/3/0/9/130969689/7447850.pdf
    • http://files.shopandcarry.com/uploads/1/3/0/7/130739664/083d110d62b67.pdf
    • https://cdn.shopify.com/s/files/1/0430/4447/0938/files/levusavujef.pdf
    • https://cdn.shopify.com/s/files/1/0428/9521/2697/files/lupawufotupuzitufad.pdf
    • https://cdn.shopify.com/s/files/1/0430/6229/6725/files/mysql_workbench_ubuntu_14._04.pdf
    • https://cdn.shopify.com/s/files/1/0428/5536/6822/files/achilles_story.pdf
    • https://cdn.shopify.com/s/files/1/0427/5470/3526/files/ffxiii_2_trophy_guide.pdf
    • https://cdn.shopify.com/s/files/1/0428/5526/8519/files/4590768220.pdf
    • https://cdn.shopify.com/s/files/1/0435/5604/4959/files/getumagowepuvuxozorekev.pdf
    • https://cdn.shopify.com/s/files/1/0430/0832/7829/files/dujejokegojuzilupa.pdf
    • https://cdn.shopify.com/s/files/1/0432/7355/2040/files/47866498422.pdf
    • https://cdn.shopify.com/s/files/1/0431/4526/5312/files/wusinabutubididu.pdf
    • https://cdn.shopify.com/s/files/1/0431/4392/1820/files/medunagasigifowul.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_off0000a083.bin
317888374b870a6642c42768b476efe789983ac81840476bd7bd7e7b58f90dbd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA083 5360 bytes
font_01_sfnt_off0000b2c5.bin
f7cfd1c7e03a1afb378b9622dcac1b1177620a1e30549bb9a0a752eb60104547		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB2C5 14520 bytes

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