Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3f9fd59619a90a9…

MALICIOUS

PDF

54.5 KB Created: 2020-10-09 12:22:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 613bdfddce9d7c911c14b924310dd724 SHA-1: ca1a136b939d99a90e3cb3158798d67a0786201e SHA-256: a3f9fd59619a90a93f5fd0781cb8112bcd5e2d490be1d7e1f6db074cf547abd2
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links to other PDF files hosted on various platforms, indicating a link farm. One of these links, 'https://ggtraff.ru/strik?keyword=suti+message+board', is flagged as a malicious redirector. This suggests the document is designed to lure users into clicking malicious links, potentially for phishing or to download further malware. The ML classifier also strongly indicated maliciousness.

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=suti+message+board In PDF document text
    • http://files.downtowntorontodoctors.com/uploads/1/3/0/7/130739285/17805643.pdfIn PDF document text
    • http://files.forstinn.org/uploads/1/3/2/6/132680784/guledika-zodugesa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/9407/6312/files/61032109840.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0441/0517/1096/files/subinizutepa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/4897/9617/files/nadejuwopunuf.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0047/9391/files/zogek.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6856/3351/files/fibedegonazoriri.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c57140d3-5d75-4c31-9083-5c1489c3bf23/vozixegipegamifu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/337b8c5b-7885-4e8a-87af-876776ce0866/84969474444.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28897d8b-774e-4421-a669-fd8767cad95b/83143915009.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b300eeb5-d3a5-4d66-a0cc-1974c3c68072/fewepasorazumukoke.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0470/9675/8430/files/4711175351.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0478/2256/9631/files/73595475864.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0479/0380/1510/files/wugik.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/8105/5390/files/do_blue_crabs_have_hearts.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007f07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7F07 5356 bytes
SHA-256: 35b0dcefab061ec42321c5367bae96cf7fa1ed472ec2d782e99470df7f1bdf4e
font_01_sfnt_off00009111.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9111 2572 bytes
SHA-256: 55fc68924f34b08f81e8d2aa0ae70085ba046ce8d971308c6ae6159d87615787
font_02_sfnt_off00009c36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9C36 12080 bytes
SHA-256: 2ee93fa6ab671e78698cf438a54e1ea8d6dd1dadad768ca4f1b3c6b4d6b63aeb
font_03_sfnt_off0000c3ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3AC 1736 bytes
SHA-256: 5095ccdfdd328c3f25b1766e9c65bca58fa839170fcb9f3db3c20e130d955aff

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