Malicious PDF — malware analysis report

Static analysis result for SHA-256 7769b83ad7e1bd5d…

MALICIOUS

PDF

52.7 KB Created: 2020-08-23 04:41:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0d22d5056e796a0be219874f0b46d507 SHA-1: 1a0aaed9c50493f55ae50c83b1dd528f4304cab6 SHA-256: 7769b83ad7e1bd5db29d30cd1e1287c2c94293b44f236ffa20a90d7a74c5e813
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, including a primary link to a known malicious redirector at 'ttraff.com'. The document body, though heavily obfuscated, contains text suggesting a lure related to 'epidemiology questions and answers pdf'. The presence of many external links, including a malicious redirector, indicates an attempt to lead the user to malicious content, likely 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=epidemiology+questions+and+answers+pdf
    • http://vonafus.silkeukena.com/uploads/1/3/2/6/132682663/nebexigipupeni.pdf
    • http://files.amyouthsports.org/uploads/1/3/1/8/131857152/jopisopiza-takebeja-xizoxav.pdf
    • http://files.kristinasdesignpalace.net/uploads/1/3/2/7/132710780/wugefetud.pdf
    • http://rixuvo.luxaeternasolar.com/uploads/1/3/1/4/131437092/mibokigipaluxere.pdf
    • http://joxofe.krystenlindsay.com/uploads/1/3/1/6/131606263/nilagokaja.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/3123/2674/files/67422467474.pdf
    • https://cdn.shopify.com/s/files/1/0431/0119/2352/files/jazalinabipakamaguvi.pdf
    • https://cdn.shopify.com/s/files/1/0428/3708/2271/files/denbigh_high_school_luton_ofsted_report.pdf
    • https://cdn.shopify.com/s/files/1/0438/6911/0432/files/italian_grammar_rules.pdf
    • https://cdn.shopify.com/s/files/1/0436/7443/5737/files/arbaeen_nawawi_urdu.pdf
    • https://cdn.shopify.com/s/files/1/0432/1925/5456/files/lalasixodonoxiwezoko.pdf
    • https://cdn.shopify.com/s/files/1/0430/6518/0321/files/definition_of_absolute_poverty.pdf
    • https://cdn.shopify.com/s/files/1/0436/7984/2457/files/shrink_mac.pdf
    • https://cdn.shopify.com/s/files/1/0438/8116/9051/files/81168786442.pdf
    • https://cdn.shopify.com/s/files/1/0435/3005/9940/files/cadillacs_and_dinosaurs_rpg.pdf
    • https://cdn.shopify.com/s/files/1/0435/8917/3411/files/android_update_for_huawei_p7.pdf
    • https://cdn.shopify.com/s/files/1/0450/5898/2040/files/bearing_capacity_of_layered_soil.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_off00008f1f.bin
5fb6b9a1025986c6a1f0395e59a427791507b628afa4c224e092bf55d1eb959f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8F1F 5640 bytes
font_01_sfnt_off0000a24b.bin
e535384ba66944607cc919c1022575356c4df6ddb97b9b8c953871488d7190a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA24B 10468 bytes

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