Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1b3e3087f0105b4…

MALICIOUS

PDF

37.5 KB Created: 2020-10-31 11:03:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: faec5d11e57107612b39cb60e0617904 SHA-1: b623a7a996397d32928d870755ba16bc1acac8c0 SHA-256: c1b3e3087f0105b459604ed05245005f42b809b61f74c8ff2724f9525dcf3e0f
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. The document body text, though heavily obfuscated, contains URLs that are likely part of a link farm or phishing attempt, aiming to redirect users to malicious sites.

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://ggtraff.ru/123?keyword=infinite+campus+login+barrow
    • https://jatilesaza.weebly.com/uploads/1/3/4/3/134316516/jafigotaxorolegiw.pdf
    • https://juzugimigiroteg.weebly.com/uploads/1/3/2/3/132302883/affd96fc6f7.pdf
    • https://fakimodixoto.weebly.com/uploads/1/3/0/7/130739088/vuvidax-noxowezajuvalu-gajedeki-tusaz.pdf
    • https://nipufijupetobug.weebly.com/uploads/1/3/1/4/131482996/funanulifesofu.pdf
    • https://rasuzumiketasak.weebly.com/uploads/1/3/4/3/134393825/7044340.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/e94882b8-7a41-458b-9090-373b11537011/meluxejajaja.pdf
    • https://uploads.strikinglycdn.com/files/af175610-3b6c-4b8d-a8f2-4b7b750d2091/84230405037.pdf
    • https://cdn.shopify.com/s/files/1/0485/1620/2651/files/jackson_hole_wyoming_map.pdf
    • https://uploads.strikinglycdn.com/files/8aef2148-0a05-4b44-bd60-d6b9bce15f01/34622165663.pdf
    • https://s3.amazonaws.com/tometubufimopim/32702140238.pdf
    • https://uploads.strikinglycdn.com/files/e8904ad9-a75f-4d9b-b2b5-fc99d7e4aad9/kuzopugiw.pdf
    • https://s3.amazonaws.com/memul/cazadores_de_sombras_origenes_angel_mecanico.pdf
    • https://s3.amazonaws.com/ligole/alexandra_daddario_san_andreas_interview.pdf
    • https://s3.amazonaws.com/petuzutemixuvod/wumituzix.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_off00005186.bin
6e7b9547df5788d16850bab670761afa54826ca1496e6ba64ec831c84b1c7e6c
pdf-font-stream PDF embedded font (sfnt) at offset 0x5186 5504 bytes
font_01_sfnt_off0000643f.bin
5433508337f974ffb3b8de6c9b9daed59e9d40a76c31ea00f7c3b0e518083328
pdf-font-stream PDF embedded font (sfnt) at offset 0x643F 11440 bytes