Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0f692c3e12e0e79…

MALICIOUS

PDF

41.8 KB Created: 2020-11-08 11:46:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: f3e3cf4f5c8bb128b825bbabf1ce3490 SHA-1: 826e8cf87dec2f43ecbe354bfd31116d5dc61136 SHA-256: f0f692c3e12e0e79def1e5ec483806808fbfcc93d9a09e629bbfaddc906b3d29
94 Risk Score

Malware Insights

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

The PDF file contains a link to a known malicious redirector, which is designed to lead users to malicious infrastructure. The document body, though heavily obfuscated, contains text that suggests it is a manual for a thermostat, likely a lure to entice users to click the malicious link. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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/123?keyword=manual+for+venstar+t2800+thermostat In 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/9dcf6888-0836-4dce-8217-5a0b4e47f227/32342688203.pdfIn PDF document text
    • https://wukobakuvev.files.wordpress.com/2020/11/84559218753.pdfIn PDF document text
    • https://s3.amazonaws.com/vabemavuputenif/4283789378.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2aaa3f9-773d-40b6-bdd3-632fc6ef14c2/9056636783.pdfIn PDF document text
    • https://botebofeji.files.wordpress.com/2020/11/15963812645.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a443d273-891f-4aea-8803-bd3e048b4509/buffalo_wild_wings_training_manual.pdfIn PDF document text
    • https://zopovamodutu.files.wordpress.com/2020/11/mifufavagatelajoru.pdfIn PDF document text
    • https://logonojag.files.wordpress.com/2020/11/19462288202.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3615541b-fa2d-435d-be6e-0ee9ae9705e9/wight_dd_beyond.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69daeaeb-3818-4f3e-8d1d-c8b17f7fac8c/totovaketagimatutivi.pdfIn PDF document text
    • https://pidunobim.files.wordpress.com/2020/11/94634162577.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aee09f9f-13ac-489e-95e3-66d52ed9b102/practically_speaking_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65b65d07-5fe8-45e1-affd-b76cc983cdaf/mumorawewupevitomup.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_off000061a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61A5 5540 bytes
SHA-256: 4eee61a76d6be567dd23bf0052c42ad004249c75dda407fccb93cc1818aeddbd
font_01_sfnt_off00007463.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7463 11632 bytes
SHA-256: 1e40a8f502b6e73333e4f49e39e41ad528a5cd6e7d9e83324a87e99f01b8e403