Malicious PDF — malware analysis report

Static analysis result for SHA-256 70b91ad53d777920…

MALICIOUS

PDF

71.2 KB Created: 2020-08-06 07:26:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cea48d0707693d2e86bf12a23ce8d86f SHA-1: 415b9b89b1abc074d3b653d9f0feaaf8695a3cc9 SHA-256: 70b91ad53d777920d3ca7952f9560f50c5e4d5dfa4c178490b6d17eb6ac44f08
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a redirector infrastructure known for malicious activity. The document body, though heavily obfuscated, contains URLs that appear to be part of a link farm designed to attract search engine traffic. The primary malicious URL identified is ttraff.ru, which is flagged as a redirector.

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.ru/wb?keyword=proliant%20dl380%20g5%20manual
    • http://files.bestlastdances.com/uploads/1/3/1/6/131636726/10ecce4904.pdf
    • http://jivudor.geoprogrammes.com/uploads/1/3/0/9/130969744/55130.pdf
    • http://rubebotum.rtpliving.com/uploads/1/3/0/8/130814411/65a16f10.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0430/3428/0087/files/95475272983.pdf
    • https://cdn.shopify.com/s/files/1/0429/9322/1783/files/77980585726.pdf
    • https://cdn.shopify.com/s/files/1/0427/4136/6951/files/41407933520.pdf
    • https://cdn.shopify.com/s/files/1/0429/8991/2218/files/77189912530.pdf
    • https://cdn.shopify.com/s/files/1/0437/4321/5767/files/86797601530.pdf
    • https://cdn.shopify.com/s/files/1/0429/3050/3843/files/jiwuxujuwatewezasanovifat.pdf
    • https://cdn.shopify.com/s/files/1/0431/4529/8080/files/five_go_to_billycock_hill.pdf
    • https://cdn.shopify.com/s/files/1/0428/3426/4231/files/pomomudiki.pdf
    • https://cdn.shopify.com/s/files/1/0435/5116/2523/files/automatic_pump_control_circuit_diagram.pdf
    • https://cdn.shopify.com/s/files/1/0428/5195/8947/files/bapow.pdf
    • https://cdn.shopify.com/s/files/1/0437/0386/1416/files/dajesefezaduvijiw.pdf
    • https://cdn.shopify.com/s/files/1/0439/3772/6622/files/cheshire_cat_blink182.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd82.bin
de3519b58d40302509753d63862664d3433d3d763c625353c797b882df693509		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCD82 5356 bytes
font_01_sfnt_off0000df89.bin
649fd2e1ea0ddc5feeeee861daf55658b127a4ab9ea771708056aeaf93522e87		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF89 10080 bytes
font_02_sfnt_off000101c8.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101C8 4324 bytes

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