Malicious PDF — malware analysis report

Static analysis result for SHA-256 c49b86b246a25470…

MALICIOUS

PDF

47.2 KB Created: 2020-08-24 02:04:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 211825027924cb5ad9237be59802d59a SHA-1: c18a0d495732d2e2d90bd693ca1c019bc2accedd SHA-256: c49b86b246a25470e5addabc045e003724151c8f9bbf785f7f5ab967adfe722f
154 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link pointing to 'ttraff.com' which is associated with a VPN proxy master lure. The document also features a large number of embedded links, many of which point to Shopify domains hosting PDF files, suggesting a link farm or SEO poisoning tactic. The ML classifier strongly indicated maliciousness, and the presence of a redirector URL confirms a malicious intent to lead the user to a harmful site.

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=vpn+proxy+master+windows
    • http://falade.eibenteaching.com/uploads/1/3/2/6/132682974/dujakubatir-rawemeso-sawula.pdf
    • http://files.buildingabond.org/uploads/1/3/1/8/131858044/zifewelevukuges.pdf
    • http://files.ncsdactivities.com/uploads/1/3/0/8/130874432/254000ac3.pdf
    • http://files.katieishdesigns.com/uploads/1/3/0/7/130775462/f4972637d128218.pdf
    • https://cdn.shopify.com/s/files/1/0431/4395/4594/files/collins_english_spanish_dictionary.pdf
    • https://cdn.shopify.com/s/files/1/0428/1381/6995/files/26018414649.pdf
    • https://cdn.shopify.com/s/files/1/0438/5538/0630/files/17193313757.pdf
    • https://cdn.shopify.com/s/files/1/0430/5682/4471/files/69353925017.pdf
    • https://cdn.shopify.com/s/files/1/0435/8501/1871/files/69753773857.pdf
    • https://cdn.shopify.com/s/files/1/0433/0127/3755/files/15836175075.pdf
    • https://cdn.shopify.com/s/files/1/0431/5480/0796/files/92172319585.pdf
    • https://cdn.shopify.com/s/files/1/0435/0771/2155/files/70927246811.pdf
    • https://cdn.shopify.com/s/files/1/0432/4062/0200/files/76355935327.pdf
    • https://cdn.shopify.com/s/files/1/0433/8457/0019/files/atharva_veda_in_tamil.pdf
    • https://cdn.shopify.com/s/files/1/0437/2935/4903/files/rufewaregi.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_off00006e65.bin
135fabbe966351a195ca14e3e0c03c15c634cec932290c60f6e5f5535bc8e6a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E65 5088 bytes
font_01_sfnt_off00007fa3.bin
e39ff2373834b2c5a890c7118f60d632f77979b7a9ffa6674177e97f8ddb471b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7FA3 10012 bytes
font_02_sfnt_off0000a1dd.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA1DD 4324 bytes

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