Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6b02292779fad95…

MALICIOUS

PDF

43.8 KB Created: 2020-10-23 05:33:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 9aaf1da62c7bfdd18a91007c7dcee16f SHA-1: e030c62ef9a825c4241804736009f384e8b16f7d SHA-256: f6b02292779fad95466f96483472c237e56e504973abcf05c254b722b3d3d8a2
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for a malicious redirector link, which is further supported by a large number of embedded URLs pointing to external PDF files. The document body, though garbled, contains a URL that matches one of the extracted links, suggesting an attempt to trick users into clicking through to potentially malicious content. 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://ttraff.link/123?keyword=le+journal+d%2527aur%25C3%25A9lie+laflamme+tome+2+pdf In PDF document text
    • https://sovopubi.weebly.com/uploads/1/3/0/7/130775052/tolubikajotul-satuxejer-woxuw-pazamedazit.pdfIn PDF document text
    • https://zijananuwale.weebly.com/uploads/1/3/4/4/134438714/11820.pdfIn PDF document text
    • https://rofexigu.weebly.com/uploads/1/3/0/7/130738805/2877389.pdfIn PDF document text
    • https://zadumeredevasax.weebly.com/uploads/1/3/1/4/131453870/4929228.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368486/normal_5f8a51e282ab9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370307/normal_5f8e11a611d82.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365646/normal_5f873f0639771.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368777/normal_5f87e83d6a023.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370087/normal_5f8d8e46d5aef.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/ladojenefe/novafokofesajasolopadaj.pdfIn PDF document text
    • https://s3.amazonaws.com/defujo/pifipis.pdfIn PDF document text
    • https://s3.amazonaws.com/memul/logic_gate_table.pdfIn PDF document text
    • https://s3.amazonaws.com/wonoti/denotation_and_connotation_in_semantics.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files/ziguwirebujiranalusoxila.pdfIn PDF document text
    • https://s3.amazonaws.com/babuxufarizuxur/wirazugukizilav.pdfIn PDF document text
    • https://s3.amazonaws.com/vabedafozo/gross_anatomy_of_the_brain_and_cranial_nerves.pdfIn PDF document text
    • https://s3.amazonaws.com/zetare/41962533271.pdfIn PDF document text
    • https://s3.amazonaws.com/rekorewexidiwo/52118446998.pdfIn PDF document text
    • https://s3.amazonaws.com/fekaduvopigab/bilharzia_life_cycle.pdfIn PDF document text
    • https://s3.amazonaws.com/zetare/ritor.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_off000066eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x66EB 5332 bytes
SHA-256: a15535111a6ef47253c521ee80f696c91d33deae70dd35dbd5bb23449cee79e4
font_01_sfnt_off000078c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x78C9 12448 bytes
SHA-256: 8c0ae21f6674c468ece5f7e230e29232cee042764a6050ba926be676d5b35012

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