Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba8274e669abeb94…

MALICIOUS

PDF

50.2 KB Created: 2020-10-10 21:57:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 79617598622250c0b67fa6a842a0f526 SHA-1: 66a20b08c78ba44f582d510423a1dbc73284f7b8 SHA-256: ba8274e669abeb94517280ab8191c291489b6f9aaf3a11547a00083abe83169a
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, including one identified as a malicious redirector. The document body, though heavily obfuscated, contains text suggesting it is an 'answer key' and includes the malicious URL. This indicates a phishing or scam attempt designed to redirect users to malicious infrastructure.

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://cctraff.ru/pify?keyword=discovering+our+past+medieval+and+early+modern+times+answer+key In PDF document text
    • http://files.evansadopt.com/uploads/1/3/2/8/132814826/6367200.pdfIn PDF document text
    • http://files.frenchtoowoomba.com/uploads/1/3/0/7/130776132/484f4aa9058e80.pdfIn PDF document text
    • http://files.huihefurniture.com/uploads/1/3/2/3/132303286/5841039.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0485/7554/5509/files/a_love_to_last_april_30_zodiac.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/5656/9249/files/persona_5_game_english_voice_actors.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2852/8799/files/xofefefarodebetuj.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0495/9934/8885/files/wood_county_jail_inmates.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/1609/7439/files/waridoretaminig.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0478/2479/7855/files/diamond_infinite_edge_owners_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/707f6181-1209-463b-8287-52c583002df4/sogifidudefakibedosomeg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/472dd03c-ca24-4a43-9c5d-fde797877b6f/77207287749.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/411ac67f-f62a-41f7-954f-ed2373a8e780/24594661972.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007797.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7797 5592 bytes
SHA-256: 101dfa88e5dbea10e400bc3f26f18c54f0223cf0f88dd854407aa5c0472f143f
font_01_sfnt_off00008a9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A9B 10240 bytes
SHA-256: 95f4c6f6c0ece0858e9ec940fbaeffe1ed141cbab134e3b82f4f3b7da9f05987
font_02_sfnt_off0000ad9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD9B 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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