Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bb8a266e567b274…

MALICIOUS

PDF

47.2 KB Created: 2020-10-11 12:50:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: feaa7cf3fa31a5e063e923a4b44db916 SHA-1: 2fe32b2c9917c64f3b9f8077abd63fd91eedc584 SHA-256: 9bb8a266e567b27479b78353c14d57a72f341b5e1f241fdd458281747645ba04
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with at least one identified as a redirector to known malicious infrastructure. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains a URL that matches the malicious redirector, suggesting an attempt to disguise the malicious destination. The presence of multiple PDF links points towards a link farm or a method to distribute 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 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/strik?keyword=sobre+heroes+y+tumbas+pdf In PDF document text
    • http://files.spiritualrealmconsulting.net/uploads/1/3/0/9/130969065/mafabaganonad.pdfIn PDF document text
    • http://files.our-lady.org/uploads/1/3/1/6/131607486/varepet.pdfIn PDF document text
    • http://files.jesus-our-blessed-hope.com/uploads/1/3/1/4/131452904/1698859.pdfIn PDF document text
    • http://files.funkytownculture.com/uploads/1/3/2/8/132815750/puwabipiruza.pdfIn PDF document text
    • http://files.wessidevibrationsinc.com/uploads/1/3/1/0/131071114/5648360.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/e031dee5-9853-4bc0-81c2-ec6aa47fe1ad/42716048473.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44f0704a-3c26-473c-ad9d-5b24dde3c015/4184749665.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6f251b0-87e1-4911-9476-1f43ed382373/11589088920.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6bf8d5f7-2dd2-42fa-8dd3-c1cad57801ec/59302650708.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cbfe50c8-9d45-4637-a9b4-648e7b7695c5/4836667327.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8960452-c659-424b-b699-480ad193eb22/1620684495.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32d5d4a5-e8d3-4085-9563-5c45c36069c4/jaxigate.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6129e3f-cfa5-4f9b-9a5e-04ef31a8225f/28108106741.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8248d718-6dae-42e5-9039-449d02ff0d9e/36608764616.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f06abbb-4d86-42e4-8eb6-8686463653f8/51957518906.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a440c447-1e8b-4079-b111-54908fdf6a54/zalelalodarokunukux.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_off00007730.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7730 5596 bytes
SHA-256: 806f5b142bbdfcf7f2cf1c6b30319ce23402b726b2dfa32c1ba61e1c0f5132a2
font_01_sfnt_off00008a0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A0F 11072 bytes
SHA-256: e7ea62edea653db9e26271d6d72f01cfa141316ad7b29e3aae0bf83f2b1a1f38

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