Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f7bf3aa46f531b1…

MALICIOUS

PDF

33.2 KB Created: 2020-11-01 04:13:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 1175e9258306c0798da59fa8a5ab39c4 SHA-1: dae8505e653121ce6b4bfeac7d9e10643931422f SHA-256: 0f7bf3aa46f531b1fa4494f3dd9e554f34f674e0edb04d67ad61aeec85b10ee8
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document contains a large number of external links, many of which point to potentially malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that appears to be a lure for users interested in firearm components. The presence of a malicious redirector link and a link farm suggests an attempt to distribute malware or phish for credentials.

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://ttraff.link/123?keyword=rcbs+rock+chucker+supreme+primer+arm In PDF document text
    • https://cdn-cms.f-static.net/uploads/4382620/normal_5f9d325e3c64c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402267/normal_5f976ccfc304f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367668/normal_5f87b08b56e38.pdfIn PDF document text
    • https://jawowigo.weebly.com/uploads/1/3/0/7/130774982/fukorojewugikojulo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382618/normal_5f9739cd407e6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372707/normal_5f894ea62e4a2.pdfIn PDF document text
    • https://keniwuki.weebly.com/uploads/1/3/1/4/131483234/sokilijaw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kijelopazekune/60695112383.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1dfeb8f6-72b1-48f9-8f42-f96bcfa1dc6e/47233176538.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/136b9cca-b231-4638-bd10-17ae5877ca33/39074654978.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f634bbc-e165-4202-8ee1-e46ff6216cb4/42640032246.pdfIn PDF document text
    • https://s3.amazonaws.com/ladojenefe/rekimugokugerimufuno.pdfIn PDF document text
    • https://s3.amazonaws.com/zobuwubedak/bukuwafugowu.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_off0000457c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x457C 5352 bytes
SHA-256: 87e99232a908f3935c19eb87aaaa620e1e30f6a20353ce5149068c8cc0b94e28
font_01_sfnt_off00005781.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5781 9688 bytes
SHA-256: e2b4b259a8de147d34b5e3ad59920f468c1520f66c5aee0d9ede1c73bf93f69c

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