Malicious PDF — malware analysis report

Static analysis result for SHA-256 93bf680a170dae40…

MALICIOUS

PDF

52.3 KB Created: 2020-10-31 13:54:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 9b642c7f312fe36e6e06e6a1084c2dec SHA-1: 385c4ccfd5798d1e0f421708f84f293c327ff3a0 SHA-256: 93bf680a170dae40c2ccf28a138de8a28cae64e778d604af346011c23390c15e
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file contains a large number of embedded links, many of which point to external PDF files hosted on disposable domains and link farms. One of the primary links directs to a known malicious redirector, indicating a probable phishing or malware distribution attempt. The ML classifier strongly supports the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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.ru/123?keyword=here+richard+mcguire+pdf+free In PDF document text
    • https://musiwimo.weebly.com/uploads/1/3/4/3/134359140/1077303.pdfIn PDF document text
    • https://fefaxositepimu.weebly.com/uploads/1/3/3/9/133986539/popupudojefewujasixe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369149/normal_5f8bd1cc2ff88.pdfIn PDF document text
    • https://tavumake.weebly.com/uploads/1/3/2/7/132740551/65d5b005b7c2ba6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419857/normal_5f97f04374a81.pdfIn PDF document text
    • https://laxuruvu.weebly.com/uploads/1/3/1/4/131482832/fe00c79d6c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369182/normal_5f90442763479.pdfIn PDF document text
    • https://pofisuxix.weebly.com/uploads/1/3/4/0/134016862/2bd5179dc5036b2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385231/normal_5f8cb0b2858fd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381964/normal_5f8d211aec4ec.pdfIn PDF document text
    • https://vasedowazapen.weebly.com/uploads/1/3/4/3/134320052/fec921af2.pdfIn PDF document text
    • https://tevumusavobe.weebly.com/uploads/1/3/4/1/134108657/jirorev_tivowevatajo_bodikalibur.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424361/normal_5f9bf2d53c729.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373757/normal_5f90f1554f6c2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366339/normal_5f874a5831a84.pdfIn PDF document text
    • https://xovadodelemowuz.weebly.com/uploads/1/3/1/3/131383330/powatemepime_fagob_sudava_melijogadosajal.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00009e81.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x9E81 21780 bytes
SHA-256: 324da5584a471bdc9fbac511f46c81f908d46e8d0b16f076a681a0bafa286cc4
font_00_sfnt_off0000684e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x684E 5320 bytes
SHA-256: 99dac51ac59464027b0e8bc8932d907e0e2a488ffe71c81556ad4b15af49ab16
font_01_sfnt_off00007a40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7A40 10520 bytes
SHA-256: 5d2e38f5574043de68a8539d928454ca6af4dc09ac9639fe9d42b1218a1f9ecd

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