Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc99bb1dc73f3b23…

MALICIOUS

PDF

39.2 KB Created: 2020-08-05 10:17:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3abba268b7b20bfb7034596d2a9e95e2 SHA-1: 57a4713bf5df4a1176e0889c85a6ea8aed6c4086 SHA-256: bc99bb1dc73f3b23907f6df3a1dc7bc01a91fee7ca2fd3075b76986b543036d2
120 Risk Score

Malware Insights

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

The PDF contains a link farm of 14 external PDF files, with the primary malicious link pointing to a redirector. The document body itself is heavily obfuscated and contains metadata suggesting it was generated by wkhtmltopdf. The presence of a malicious redirector and a large number of external links indicates a social engineering attempt to lead the user to malicious content.

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=alkyne+nomenclature+pdf
    • http://files.embracingtheimpossible.com/uploads/1/3/1/4/131436981/nerurogob.pdf
    • http://files.lovefoundationproject.com/uploads/1/3/1/4/131453990/eee17ce9a5458.pdf
    • http://files.americanbuttercupclub.org/uploads/1/3/2/7/132740405/5337151.pdf
    • http://files.northcascadeyouthfootballleague.com/uploads/1/3/1/8/131858540/nozisozegex.pdf
    • https://cdn.shopify.com/s/files/1/0428/2076/3804/files/dadewikegilefogonibagap.pdf
    • https://cdn.shopify.com/s/files/1/0431/1403/7397/files/fantasia_model_aiy.pdf
    • https://cdn.shopify.com/s/files/1/0432/6667/0745/files/idsa_neutropenic_fever_guidelines.pdf
    • https://cdn.shopify.com/s/files/1/0433/4105/4111/files/bcs_theory_notes.pdf
    • https://cdn.shopify.com/s/files/1/0431/9641/6161/files/fusaligetunujokotowug.pdf
    • https://cdn.shopify.com/s/files/1/0432/6853/8521/files/battlestar_galactica_season_1_torrents.pdf
    • https://cdn.shopify.com/s/files/1/0427/9785/8972/files/48701177921.pdf
    • https://cdn.shopify.com/s/files/1/0435/7206/8520/files/tet_answer_key_2020_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/rijakilijupefiwopoxafeza.pdf
    • https://cdn.shopify.com/s/files/1/0428/8049/9879/files/median_of_three_quicksort_java.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_off00005ba7.bin
42fb3a4e873e89622537c657fce569ae0837b41c2017b082324db7e90796b363		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5BA7 5280 bytes
font_01_sfnt_off00006d93.bin
909486ab4afdb2a0c059c1c0cb9e195ead61ef1784169caf5b4191f4be50c7a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D93 10280 bytes

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