Malicious PDF — malware analysis report

Static analysis result for SHA-256 313b2b047e448bec…

MALICIOUS

PDF

64.8 KB Created: 2020-10-27 21:03:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 9228db9d1604f94e79fe7e58adace2fe SHA-1: d8adafa06baa7c98acd0fc7656a4ade2011c0a32 SHA-256: 313b2b047e448bec00f3831744a146356ba07989adb7da7e486e44ada1a3974e
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

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 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://gettraff.ru/strik?keyword=middle+cranial+fossa+contents In PDF document text
    • https://wekubuzebebam.weebly.com/uploads/1/3/0/7/130739705/fc6d3ed86cf7e8.pdfIn PDF document text
    • https://jeponiruwapin.weebly.com/uploads/1/3/0/7/130776483/5870292.pdfIn PDF document text
    • https://xawuwotogot.weebly.com/uploads/1/3/2/6/132695388/mifoxufewafuso-losuwuge.pdfIn PDF document text
    • https://netaluzubik.weebly.com/uploads/1/3/0/8/130813777/819ac2f13.pdfIn PDF document text
    • https://xezinaruwi.weebly.com/uploads/1/3/4/4/134479948/fazopufafito.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366659/normal_5f877fbf04b74.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392652/normal_5f9137533e16b.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/07714ff0-c79c-42c5-91b5-fa8b68c5212c/webebexusotakisu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff792bf3-aa87-48cd-bcb8-dc1d16fb14c8/49245063625.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d25f6b03-32ef-41fa-a932-01c8e28d500f/misejubiro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa1c7059-e75c-4168-bbf1-19b291315bc1/23828405122.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxadol/blockchain_revolution_portugues_download.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files/linof.pdfIn PDF document text
    • https://s3.amazonaws.com/fasanag/74574206506.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8193a12f-1082-4164-9637-b88fd8384a21/tatipumo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2c6725e-7d2e-450b-a856-f696525568ca/45771572359.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_off0000c1d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1D1 5020 bytes
SHA-256: f262a8e0dd0cc4b2f6cf91b95e17f47cfeb0bb36f70b3c428cd0b8f72d36895a
font_01_sfnt_off0000d2eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2EB 10164 bytes
SHA-256: 6f1363ae1d7b8a1de789ee19f14df30eb882e557136010bd65cc07c9027b0caa

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