Malicious PDF — malware analysis report

Static analysis result for SHA-256 81ac77c9b372d2c8…

MALICIOUS

PDF

49.0 KB Created: 2020-08-30 13:09:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a1dffc7939d2672e2cf859f47dfb0b0d SHA-1: a15f14d3acec19fd52f231930f4d575801158188 SHA-256: 81ac77c9b372d2c8e73cd1da54a9c8f88b16203c34eb22231af8880eb4bd3ecb
150 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/wix?keyword=george+foreman+grill+gr20bwc+manual'. This URL is presented within the document body, disguised as a search result for a manual. The presence of numerous other external PDF links, while many are benign, suggests a link farm or redirection strategy. The ML classifier also flagged this PDF as malicious with high confidence.

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/wix?keyword=george+foreman+grill+gr20bwc+manual
    • https://static.usrfiles.com/ugd/06497e_a0bd36e26ada4b419fcfa9324a31f456.pdf
    • https://static.usrfiles.com/ugd/b8c837_f60e6bf37bba49bab33a35556f3a8162.pdf
    • https://static.usrfiles.com/ugd/b8c837_d432e32bd3b54e0988582ef2b3f4adce.pdf
    • https://static.usrfiles.com/ugd/0fdb6d_6791d6f947d24e37a117c7db0a8f5054.pdf
    • https://static.usrfiles.com/ugd/5ecadc_31d1ecdb451e4abea53dcc022bf38395.pdf
    • https://static.usrfiles.com/ugd/9dda13_fd28608f06c7476cb8d37da4c5531c52.pdf
    • https://cdn.shopify.com/s/files/1/0441/0173/0456/files/93372314324.pdf
    • https://cdn.shopify.com/s/files/1/0429/1490/6279/files/57198498231.pdf
    • https://cdn.shopify.com/s/files/1/0433/2738/9851/files/kixaxizakemepukox.pdf
    • https://cdn.shopify.com/s/files/1/0427/6636/8935/files/pedalukopurekegebubij.pdf
    • https://cdn.shopify.com/s/files/1/0435/8393/0527/files/82709035575.pdf
    • https://cdn.shopify.com/s/files/1/0429/5039/4019/files/wejalamagokivirurug.pdf
    • https://cdn.shopify.com/s/files/1/0440/2718/3269/files/puladotenepujiludatip.pdf
    • https://cdn.shopify.com/s/files/1/0449/6248/0296/files/beyond_compare_key.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006572.bin
f82bbd2364dc97238ace7c75e045e6589b7723158045deff2793cbf9480fcf1e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6572 5360 bytes
font_01_sfnt_off000077a6.bin
b4a9279359e032e78e2f1cdfcd40bb344334112da81928d883e6baa03df1bed6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77A6 15092 bytes
font_02_sfnt_off0000a6c5.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA6C5 4324 bytes

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