Malicious PDF — malware analysis report

Static analysis result for SHA-256 71fb1281e3af812e…

MALICIOUS

PDF

57.4 KB Created: 2020-08-08 07:56:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fba4d9b477c7c41ebdb8ec56dd8c4224 SHA-1: 66ad290b1a63f730fb02da6ba906a47563a24900 SHA-256: 71fb1281e3af812e06bcc892227fa594ecd681c380351a27806adc603ed0052c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a heuristic firing for linking to known malicious redirector infrastructure, specifically pointing to 'ttraff.com'. The document body, though heavily obfuscated, contains the same URL. This suggests the primary purpose is to redirect the user to a malicious site, likely for further exploitation or phishing.

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=autodesk+cfd+2020+black+book+pdf
    • http://files.eq3caribbean.com/uploads/1/3/0/8/130814466/dipos.pdf
    • http://files.happytimes-cdc.com/uploads/1/3/0/9/130969772/kodugojotalabukuxida.pdf
    • http://wexuwora.besttinyhouses.com/uploads/1/3/0/8/130874197/4156777.pdf
    • http://files.strictlyskillsbasketball.com/uploads/1/3/1/4/131411596/fixutul.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/7319/1588/files/litobi.pdf
    • https://cdn.shopify.com/s/files/1/0432/7063/5678/files/21665059991.pdf
    • https://cdn.shopify.com/s/files/1/0429/8915/8554/files/sadixufefuzadomiporena.pdf
    • https://cdn.shopify.com/s/files/1/0437/3826/7809/files/33469516364.pdf
    • https://cdn.shopify.com/s/files/1/0433/4842/6902/files/russianhits_64_radio_logo.pdf
    • https://cdn.shopify.com/s/files/1/0436/8714/9733/files/xisovilaxutarob.pdf
    • https://cdn.shopify.com/s/files/1/0437/6113/9861/files/noviximajasedoripo.pdf
    • https://cdn.shopify.com/s/files/1/0428/5631/7091/files/40309961819.pdf
    • https://cdn.shopify.com/s/files/1/0431/3127/3365/files/97246925398.pdf
    • https://cdn.shopify.com/s/files/1/0430/6042/8962/files/43053608964.pdf
    • https://cdn.shopify.com/s/files/1/0431/6453/2900/files/14746301588.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_off0000957c.bin
723ff6d86574b052ff5a54750f2de08a5bf009fd3f9b3b1d28be1056fc6e8e33
pdf-font-stream PDF embedded font (sfnt) at offset 0x957C 5520 bytes
font_01_sfnt_off0000a855.bin
83f209d91a27ad391ea572ce230e11211142848b731173b387fad4148c4dfe94
pdf-font-stream PDF embedded font (sfnt) at offset 0xA855 15724 bytes