Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8a043c1551ad61e…

MALICIOUS

PDF

45.5 KB Created: 2020-08-12 00:29:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2d29df80b6551f4ac623a1aa76e2e492 SHA-1: dd3fc2b141f93bd7a26282d0361eb186a5132b15 SHA-256: b8a043c1551ad61e195c832d8f6332ef4321cfd074f90937a4e3d830cc70c383
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'ttraff.ru'. Additionally, it exhibits characteristics of a PDF link farm, with numerous external links, including one to a Shopify domain. The ML classifier strongly indicated maliciousness. The document body, though partially corrupted, contains the malicious URL and references to other PDFs, suggesting a lure to external content that likely leads to malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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/wb?keyword=auto%20or%20manual%20truck
    • http://files.crossingovercdc.org/uploads/1/3/1/4/131437139/a7f961483.pdf
    • http://nuxode.littleacornsgodstone.com/uploads/1/3/1/3/131379578/jurejalegi-lexatajuvekeda.pdf
    • http://files.mentalhealthjunkie.com/uploads/1/3/0/9/130969241/4180528.pdf
    • http://dotagodo.congsupport.info/uploads/1/3/2/7/132710797/97fb0fe7448b86.pdf
    • https://cdn.shopify.com/s/files/1/0437/8099/7269/files/hodgdon_reloading_manual_2017.pdf
    • https://cdn.shopify.com/s/files/1/0432/6876/7907/files/importancia_del_aprendizaje_colaborativo.pdf
    • https://cdn.shopify.com/s/files/1/0435/9880/7202/files/heart_centered_leadership.pdf
    • https://cdn.shopify.com/s/files/1/0431/6856/3355/files/xesogefujadojepaxawudivo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9485/2252/files/43369157677.pdf
    • https://cdn.shopify.com/s/files/1/0449/2935/1835/files/bartleby_the_scrivener_summary.pdf
    • https://cdn.shopify.com/s/files/1/0437/7598/3765/files/18177203827.pdf
    • https://cdn.shopify.com/s/files/1/0430/8277/6729/files/estrategias_de_afrontamiento_del_estres.pdf
    • https://cdn.shopify.com/s/files/1/0437/8886/1602/files/strength_of_materials_by_rk_rajput.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/sefumiwizekoreletete.pdf
    • https://cdn.shopify.com/s/files/1/0428/8721/7319/files/ropumovagab.pdf
    • https://cdn.shopify.com/s/files/1/0431/1593/7948/files/zatid.pdf
    • https://cdn.shopify.com/s/files/1/0438/8998/3640/files/nusozimilakajijewirome.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_off0000678b.bin
9e59ecc4925458c4874dcbc6161f939210400c8cdbc27b5e3c0b89b176ad222b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x678B 4536 bytes
font_01_sfnt_off000076c9.bin
533e2fb3885c48fa7184a2df3586a9504c56c60187f0af7438665ddd92c0d3a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76C9 10756 bytes
font_02_sfnt_off00009b17.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9B17 4324 bytes

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