Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0b36fb841c5bd06…

MALICIOUS

PDF

41.3 KB Created: 2020-08-19 09:19:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: afa388bd07a2716a9de912bec5bb17db SHA-1: 66facba11d39df04cd5ffdf4be541d4bfa5af877 SHA-256: a0b36fb841c5bd06d3aae89035e5ed290eab5a022abace5fac31d705a803e4b9
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to ttraff.ru. This URL is presented to the user as a search result for "acls algorithm 2019 pdf", indicating a lure to trick users into clicking. The document also contains a large number of embedded links to external PDFs, many hosted on shopify.com, which is flagged as a link farm. 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.ru/pify?keyword=acls+algorithm+2019+pdf
    • http://pegenevep.paulmetcalf.net/uploads/1/3/0/8/130873715/4dbacb4ea8.pdf
    • http://files.how2productions.co.uk/uploads/1/3/1/0/131070581/rosurojamatubil.pdf
    • http://metamokig.branchboutique.net/uploads/1/3/2/3/132303189/f7994a93228f7.pdf
    • http://takadages.allstarclean.org/uploads/1/3/2/8/132814900/suwagovemuw.pdf
    • https://cdn.shopify.com/s/files/1/0434/7278/1478/files/infant_daily_report.pdf
    • https://cdn.shopify.com/s/files/1/0429/5950/3519/files/zogipulefonisulofaluk.pdf
    • https://cdn.shopify.com/s/files/1/0440/2331/6630/files/adobe_premiere_pro_cs4_tutorial_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/8391/4654/files/burnout_paradise_mobile_game.pdf
    • https://cdn.shopify.com/s/files/1/0427/6623/7852/files/sapukejenodezevugotonuma.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/45251784546.pdf
    • https://cdn.shopify.com/s/files/1/0430/0954/0257/files/fitted_bed_sheet_sizes_uk.pdf
    • https://cdn.shopify.com/s/files/1/0433/1008/8360/files/jelefaxapafo.pdf
    • https://cdn.shopify.com/s/files/1/0434/9244/2264/files/lepalifujadafiko.pdf
    • https://cdn.shopify.com/s/files/1/0434/6108/3301/files/world_of_warcraft_rpg_download.pdf
    • https://cdn.shopify.com/s/files/1/0440/1315/8565/files/82488372939.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_off00005f0e.bin
411701ff3cea6dd6caee934dd609fda9a8c106c2b20d45ac48ef5df327fe6383		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F0E 6040 bytes
font_01_sfnt_off00007374.bin
df5e0b447d0299f3c720bd3fe758b7d4fbd69e9fea845fd87bf01f1b812b3486		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7374 10936 bytes

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