Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b8014ec0c774823…

MALICIOUS

PDF

50.2 KB Created: 2020-08-31 20:25:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 76198389d538a4f5367d33b59a8dd73d SHA-1: 9437f7888a9eb58de1251258936b177398d4cb4c SHA-256: 5b8014ec0c774823956754bad7b08addc914419d43f36c7772cd6bfb3d6f5a4b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link to a known malicious redirector, ttraff.com, which is disguised as a guide. This indicates a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains the same URL, reinforcing the malicious intent. The ML classifier also strongly flagged this PDF as malicious.

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=lich+king+hearthstone+guide+witchwood
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/91025233068.pdf
    • https://cdn.shopify.com/s/files/1/0429/8499/7025/files/apache_autoindex_template.pdf
    • https://cdn.shopify.com/s/files/1/0439/2802/7304/files/instagram_direct_app_ios.pdf
    • https://cdn.shopify.com/s/files/1/0435/6784/1443/files/daftar_hs_code_indonesia_2020.pdf
    • https://cdn.shopify.com/s/files/1/0428/0595/2671/files/55902632508.pdf
    • https://cdn.shopify.com/s/files/1/0429/1415/2607/files/mejovokib.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/76957488457.pdf
    • https://cdn.shopify.com/s/files/1/0430/7753/3856/files/58168675281.pdf
    • https://cdn.shopify.com/s/files/1/0435/4893/4295/files/ultra_accel_ii.pdf
    • https://cdn.shopify.com/s/files/1/0435/5129/3603/files/2015_rmz_450.pdf
    • https://cdn.shopify.com/s/files/1/0427/3415/7991/files/munixuxabu.pdf
    • https://cdn.shopify.com/s/files/1/0464/6633/4872/files/daxetopofa.pdf
    • https://cdn.shopify.com/s/files/1/0430/5115/5618/files/gevakuxugowezepad.pdf
    • https://cdn.shopify.com/s/files/1/0431/9730/0885/files/daily_action_planner.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_off000086ec.bin
247bf2fbc81ce1dfbf97bfe8d227cea61bc9a5fece7f178f25508ee7316a2b27
pdf-font-stream PDF embedded font (sfnt) at offset 0x86EC 5264 bytes
font_01_sfnt_off000098e1.bin
9ffd2b6df06a999b02e59f50e68d3bf3a9a8c1c82021b0097a94251dee4b9fa3
pdf-font-stream PDF embedded font (sfnt) at offset 0x98E1 10256 bytes