Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f8356b780e5d6ff…

MALICIOUS

PDF

57.0 KB Created: 2020-10-31 03:18:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 6de937619ac71d2ea41c3f0a29e36606 SHA-1: b7bdab4008db837da1956de38197de66f049b64d SHA-256: 8f8356b780e5d6ffd162945cd1245c5404ee024f60e16ddaa0236685413c5dd2
124 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 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://ggtraff.ru/strik?keyword=250+mm+is+equal+to+inches In PDF document text
    • https://nulixedupalaz.weebly.com/uploads/1/3/0/7/130739510/4345423.pdfIn PDF document text
    • https://xusawoji.weebly.com/uploads/1/3/0/7/130739635/e040913ab219.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366956/normal_5f97668b26bfb.pdfIn PDF document text
    • https://javezevefumutew.weebly.com/uploads/1/3/2/7/132740470/nuzexarejovolibe.pdfIn PDF document text
    • https://bekonerotukabi.weebly.com/uploads/1/3/4/3/134366377/4600398.pdfIn PDF document text
    • https://pinoxelu.weebly.com/uploads/1/3/4/1/134108818/tewowexivuve_laxiv_nuzonuganataf.pdfIn PDF document text
    • http://www.opentle.orgIn 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://cdn.shopify.com/s/files/1/0502/1666/5272/files/imca_guidelines_for_rov.pdfIn PDF document text
    • https://s3.amazonaws.com/pasawexawinogad/xuwoludowexugizufop.pdfIn PDF document text
    • https://s3.amazonaws.com/tibitexil/yoga_the_science_of_the_soul.pdfIn PDF document text
    • https://s3.amazonaws.com/welanisowari/government_code_6254.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/2554/5416/files/91687249147.pdfIn PDF document text
    • https://s3.amazonaws.com/ninazarila/bangalore_central_university_time_table_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/sukedil/embryologie_du_systeme_urinaire.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/0003/7527/files/pimikiwagewowesevel.pdfIn PDF document text
    • https://s3.amazonaws.com/dovulavavo/66924185933.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://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00006a9f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x6A9F 12604 bytes
SHA-256: 9ecf9de45879c8b47386e7e8c31306503508e79b53b77d9b8fe65055c8a042f3
font_00_sfnt_off00005904.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5904 5256 bytes
SHA-256: 2fe7e87d8a609f2313b44f2d4e8f7b19703df66950c6cb84fbf895078da4991f
font_02_sfnt_off00008e0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E0D 10244 bytes
SHA-256: 6a1ffe7de6a31d9d361873d6a5e1ea73dcfb53ca7d888eb66a03c11e58fac239
font_03_sfnt_off0000b175.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB175 16272 bytes
SHA-256: 6ef70b60f60e75b3e19c513aeb7a39c6207ceb76fda3b9c5815830851e055dec
font_04_sfnt_off0000c6e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6E7 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

Open this report in the interactive analyzer, or submit your own file for analysis.