Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c6614125d624f70…

MALICIOUS

PDF

34.6 KB Created: 2020-10-11 07:45:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 726ba48b2408c165ccb1f319996bbf9b SHA-1: f9344883d6e11bd3f873be381051488b989fd17a SHA-256: 1c6614125d624f70280a8e28fb06311efd8fff306228e165275d0ea7c46d36ad
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded links, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text that appears to be a lure for a 'Roomba 700 series service manual'. The ML classifier strongly supports the malicious verdict. The primary IOC is the redirector URL which likely leads to further malicious content.

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/strik?keyword=roomba+700+series+service+manual In PDF document text
    • http://sasop.youuoyrecords.org/uploads/1/3/2/8/132814432/xegiwumebisivo-gadubifajeka.pdfIn PDF document text
    • http://files.betsybower.com/uploads/1/3/2/7/132740423/efb02cb4c57e.pdfIn PDF document text
    • http://files.thelittleyellowbuilding.com/uploads/1/3/1/4/131408502/lavud-bodedut-vitumesoleku-pipemoxinok.pdfIn PDF document text
    • http://bomefugi.tedotting.com/uploads/1/3/0/9/130969937/zawobopebejod-faviz-tubev-sidowif.pdfIn PDF document text
    • http://files.908elmstreet.com/uploads/1/3/1/3/131398428/8866261.pdfIn PDF document text
    • https://site-1037054.mozfiles.com/files/1037054/22895400130.pdfIn PDF document text
    • https://site-1036772.mozfiles.com/files/1036772/wanovep.pdfIn PDF document text
    • https://site-1039215.mozfiles.com/files/1039215/tebideliwapupik.pdfIn PDF document text
    • https://site-1040042.mozfiles.com/files/1040042/bunofup.pdfIn PDF document text
    • https://site-1036756.mozfiles.com/files/1036756/zunokigoro.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/426b580a-39ac-441e-8be1-43e1c025741e/72334675862.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a7aa2a1-94c6-45af-b932-b1066f403d60/5492425801.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df85b9ac-f0ef-40eb-af3d-c21b11a9147c/1345310861.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75918f53-1806-4dde-9379-3c21799a5627/pirawesojutawisepixa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d7c8cb7-9e7b-424f-bd77-fb82cc4b0f65/bodivigabe.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000499d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x499D 5376 bytes
SHA-256: 0826cc5f9b17a542b3e461880924910009c00c2b4325a63638cd144bf0032edf
font_01_sfnt_off00005bd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5BD5 9896 bytes
SHA-256: 184d7316b338f990e6a7f57e956d66435db0015a5389ba55152ad6206c87a56b

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