Malicious PDF — malware analysis report

Static analysis result for SHA-256 3709cb4bca550edc…

MALICIOUS

PDF

43.1 KB Created: 2020-08-12 18:28:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d959f24de6f033ba7888a9762ba7b180 SHA-1: 42f692c43c9e323fcdbd97f09b11f81b2acf190e SHA-256: 3709cb4bca550edc42de69faa7c66dd274bfa87d77ba6a8d09b9646848dafd87
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to domains associated with link farms and redirectors, including a critical redirector link to 'ttraff.cc'. The ML classifier also strongly indicated maliciousness. The primary attack pattern involves luring the user to click on these links, which likely lead to malicious content or further compromise. No scripts were extracted from this sample.

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.cc/pify?keyword=agile+testing+approach+pdf
    • http://files.greyteakettle.com/uploads/1/3/2/6/132680808/mekewobojegomomune.pdf
    • http://wugap.chloesconfections.com/uploads/1/3/0/8/130813612/getezerurati-badafax-fufifo.pdf
    • http://files.mariogovorchin.com/uploads/1/3/1/4/131413550/3129a88e14a5.pdf
    • http://vamugugu.mariasummerscakedesign.com/uploads/1/3/2/6/132682883/9502663.pdf
    • https://cdn.shopify.com/s/files/1/0432/7600/9632/files/43602219602.pdf
    • https://cdn.shopify.com/s/files/1/0430/3300/2145/files/25488486863.pdf
    • https://cdn.shopify.com/s/files/1/0430/2903/7219/files/38461916846.pdf
    • https://cdn.shopify.com/s/files/1/0432/5795/4464/files/44935190266.pdf
    • https://cdn.shopify.com/s/files/1/0433/9816/8743/files/dajulunegikimopomepoziv.pdf
    • https://cdn.shopify.com/s/files/1/0437/9272/8224/files/16289310491.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/moxudenolaruxorurafugi.pdf
    • https://cdn.shopify.com/s/files/1/0431/8547/1656/files/la_revolucion_nacionalista_de_1944.pdf
    • https://cdn.shopify.com/s/files/1/0433/8080/1701/files/ninadasesekudifewaliw.pdf
    • https://cdn.shopify.com/s/files/1/0431/2141/0210/files/2872301926.pdf
    • https://cdn.shopify.com/s/files/1/0431/1311/9905/files/taraxudeposoxaf.pdf
    • https://cdn.shopify.com/s/files/1/0434/5387/4329/files/vavipilonawexeji.pdf
    • https://cdn.shopify.com/s/files/1/0429/3066/7673/files/basic_algebraic_topology_shastri.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006aa3.bin
543690d5f75f5f14cccdf8ca4f5cf2e013da33e50635866b9cb090b743355dcb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6AA3 5408 bytes
font_01_sfnt_off00007cf9.bin
f274cb90d8f44ae3fdaf941a6da437b05cbfa949169f689a923d40b2e71feba2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CF9 10148 bytes

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