Malicious PDF — malware analysis report

Static analysis result for SHA-256 8533b8376881e853…

MALICIOUS

PDF

34.3 KB Created: 2020-08-06 16:39:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 542e0dcf931a5875012da9560fb37dca SHA-1: 166f56041cff5331c4dd6e13c0bf76d7d1ea90ec SHA-256: 8533b8376881e8533a1cb204ed539db2a179d4369cb30c8dc402df2f8705db83
120 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links, with a critical heuristic firing indicating a link farm designed to redirect users to malicious infrastructure. One of the primary links points to `https://ttraff.ru/pify?keyword=cg+bhuiya+pdf`, which is flagged as a malicious redirector. The document body itself is heavily obfuscated and contains metadata suggesting it was generated by `wkhtmltopdf`, but the primary malicious activity is driven by the extensive link farm.

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.ru/pify?keyword=cg+bhuiya+pdf
    • http://files.pamelameans.com/uploads/1/3/1/3/131384249/6959627.pdf
    • http://files.danyeldevilliers.com/uploads/1/3/0/8/130874134/dabokod.pdf
    • http://files.heathercarreiro.com/uploads/1/3/1/0/131070336/lonesexepudi.pdf
    • https://cdn.shopify.com/s/files/1/0438/1055/4016/files/rezatepusabasepazobijoxa.pdf
    • https://cdn.shopify.com/s/files/1/0432/8236/6629/files/54124153620.pdf
    • https://cdn.shopify.com/s/files/1/0435/9720/1576/files/vogejax.pdf
    • https://cdn.shopify.com/s/files/1/0431/5011/4967/files/11095157.pdf
    • https://cdn.shopify.com/s/files/1/0428/1778/1927/files/snow_white_and_the_seven_dwarfs_torrent.pdf
    • https://cdn.shopify.com/s/files/1/0431/4156/2522/files/the_giver_study_guide.pdf
    • https://cdn.shopify.com/s/files/1/0430/9798/1085/files/3297830915.pdf
    • https://cdn.shopify.com/s/files/1/0430/0560/8099/files/telugu_calendar_august_2020.pdf
    • https://cdn.shopify.com/s/files/1/0449/3587/2667/files/aquatic_resources_and_ecology.pdf
    • https://cdn.shopify.com/s/files/1/0438/8762/4344/files/lesarumiguwizaw.pdf
    • https://cdn.shopify.com/s/files/1/0428/7270/1095/files/6477658236.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_off00004a00.bin
c331849f9dc4b691cb05dc07ae6b9ab14b13f7f4b423d9c025b464d5c86b91ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4A00 5144 bytes
font_01_sfnt_off00005b83.bin
9b34515f9a215b68839da5501c43fe24f2fc75fc84cff69a5f7898a182ef75fa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B83 9776 bytes

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