Malicious PDF — malware analysis report

Static analysis result for SHA-256 67a4d22e5fbc5f8f…

MALICIOUS

PDF

48.9 KB Created: 2020-10-28 01:41:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 0fef421ed0472dbb186602ec6d6bfa38 SHA-1: 982c107e12c3bfeae8abdc492e5fa39c27f73e19 SHA-256: 67a4d22e5fbc5f8f019133bb19c7b57589c745381dba083665568176f17fed06
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

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=modern+physics+resnick+halliday+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4373239/normal_5f8e3417613ca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366312/normal_5f918bc64d58b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371523/normal_5f8aeaafca402.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414486/normal_5f98a894b4e21.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413373/normal_5f9575dc414ec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384142/normal_5f8e1a5b8a80f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372987/normal_5f89c909df573.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388285/normal_5f919ed11f102.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367275/normal_5f8d8e15114b1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381539/normal_5f8e69eb0dd05.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367296/normal_5f8aa489237ae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387046/normal_5f8eb083dde7f.pdfIn PDF document text
    • https://wekubuzebebam.weebly.com/uploads/1/3/0/7/130739705/5897150.pdfIn PDF document text
    • https://bebamewikirebu.weebly.com/uploads/1/3/0/8/130874540/losig_mezifiji_wosuxexa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/ffe61b84-7d17-4c37-9bbd-1f9017315b43/flaviano_amatulli_valente_libros.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34840369-cf11-4fb8-a434-03940f69c6e9/lolugiweruxivipujeluja.pdfIn PDF document text
    • https://s3.amazonaws.com/fowikorejodi/36732651582.pdfIn PDF document text
    • https://s3.amazonaws.com/bubodeliza/waltz_for_debby_sheet_music.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000715d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x715D 5124 bytes
SHA-256: 653acc97ca51ee8fcc441f5f537bafe9e380449cd2fd178f9e5333e1fdae7e20
font_01_sfnt_off000082bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x82BD 10980 bytes
SHA-256: 0a42faf0d3d243ad424367abe6142bb7793368929507cb004ee7098130b2a777
font_02_sfnt_off0000a81d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA81D 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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