Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bdb5263ebfe22cb…

MALICIOUS

PDF

53.2 KB Created: 2020-10-29 15:40:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 37ed3ec783fad5c3719f97e7eb56acfd SHA-1: ef4cbd594b2d66c781977831380cea084186d3fb SHA-256: 8bdb5263ebfe22cbefddc0b3981498cb65c41b69eb7d70066436398983c5960e
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/aws?keyword=unit+4+progress+check+mcq+ap+human+geography In PDF document text
    • https://kufojomarolov.weebly.com/uploads/1/3/4/4/134401526/84eaa0bec9c.pdfIn PDF document text
    • https://mitemulesebiped.weebly.com/uploads/1/3/4/4/134479511/nilegado_tavuramunejibuz_minop_gerelasemuwix.pdfIn PDF document text
    • https://suganolorifumu.weebly.com/uploads/1/3/0/8/130814011/2763505.pdfIn PDF document text
    • https://megadezatesaram.weebly.com/uploads/1/3/0/7/130776649/7e0fd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/1002f8e5-6558-424e-951d-8029e96b685d/zapum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e02bdb7-553a-4f4d-ba68-8e519e405d09/pisuzevideselem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f926ea2-c156-4ab2-ae70-7946ed924214/relief_society_newsletter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/862613b4-ebe1-455f-82ac-c760c2dd493e/tisilofituvif.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/3887/4037/files/fenomeno_migratorio_en_mexico.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4649/3605/files/resignation_letter_in_gujarati.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/5008/1183/files/sample_employment_letter_for_uscis.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/2670/0696/files/pugusozom.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/2825/0276/files/61676078585.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006aaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6AAA 5688 bytes
SHA-256: 1af2614392b0684dff0bcc7ae046df33ceacdc25f7939985eb9b436a734b7624
font_01_sfnt_off00007deb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7DEB 3060 bytes
SHA-256: 4198bddb0fd92cccfacca58aa1f04ab37c2e25c21e0c300bd41f9ac2d798be3f
font_02_sfnt_off00008a5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A5D 11100 bytes
SHA-256: 5ede7724506a147d3bb0f51ff6c964351000c35123aee9e6aea1749a349784e2
font_03_sfnt_off0000b05d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB05D 16120 bytes
SHA-256: 425a01be9e4249f305d3449e9f6a0e0ae079ed45e941ed03c7a4f74a284d6bdb

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