Malicious PDF — malware analysis report

Static analysis result for SHA-256 86c298ad12c10b92…

MALICIOUS

PDF

42.0 KB Created: 2020-08-08 18:46:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fecddd217ba5b531506169217af60755 SHA-1: afe97d354d0c51c48fb1398906a2cee7302e2f25 SHA-256: 86c298ad12c10b92fdb85997c2102b547b0eb33399675733056133c2582b7e04
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, with one identified as a malicious redirector. The document body, though heavily obfuscated, includes the URL 'https://ttraff.com/pify?keyword=aula+internacional+1+espa%25C3%25B1ol+pdf', suggesting a lure to a malicious site. The presence of a link farm and a critical heuristic firing for malicious redirector links indicates a high likelihood of this document being used for phishing or malware distribution.

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.com/pify?keyword=aula+internacional+1+espa%25C3%25B1ol+pdf
    • http://files.dominicjwalsh.com/uploads/1/3/2/6/132695339/7632490.pdf
    • http://gumuken.airpro-1.com/uploads/1/3/0/7/130775448/xukukumuzudazevigofu.pdf
    • http://files.bayareaentertainer.com/uploads/1/3/1/6/131636632/68b8f04d85.pdf
    • http://files.jandjfinancialsolutions.com/uploads/1/3/1/4/131483337/3509972.pdf
    • http://files.calliopeahc.org/uploads/1/3/0/9/130969526/gekofagukaxefi-baxijuju.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/7188/9817/files/13672575478.pdf
    • https://cdn.shopify.com/s/files/1/0429/5308/0991/files/gixotavanowiwupufadipov.pdf
    • https://cdn.shopify.com/s/files/1/0433/5108/1118/files/rovuneranazafikog.pdf
    • https://cdn.shopify.com/s/files/1/0429/9928/3861/files/1920450185.pdf
    • https://cdn.shopify.com/s/files/1/0429/7369/2063/files/arita_globe_valve_catalogue.pdf
    • https://cdn.shopify.com/s/files/1/0431/0496/0661/files/razer_synapse_won_t_open_windows_10.pdf
    • https://cdn.shopify.com/s/files/1/0430/1763/3949/files/24311683099.pdf
    • https://cdn.shopify.com/s/files/1/0429/6933/3916/files/wbpsc_assistant_engineer_civil_syllabus.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nagexonulelaxefirulilona.pdf
    • https://cdn.shopify.com/s/files/1/0427/5775/0951/files/gexovarum.pdf
    • https://cdn.shopify.com/s/files/1/0447/2075/0745/files/keihin_carb_tuning_manual.pdf
    • https://cdn.shopify.com/s/files/1/0435/6544/9371/files/guturegojagitojo.pdf
    • https://cdn.shopify.com/s/files/1/0428/4776/4636/files/38723007115.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/91960476686.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000060ae.bin
93a1576f6cf82c13fc1d3bf944553301d10536c560abff00df9a093cec808337		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60AE 5404 bytes
font_01_sfnt_off000072df.bin
2d159523acb697d2bd61f9ebde12d5b25a5f69d98c4c4dd9855c58e58f4d5500		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72DF 11680 bytes

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