Malicious PDF — malware analysis report

Static analysis result for SHA-256 f38d164c60216ba7…

MALICIOUS

PDF

43.4 KB Created: 2020-07-08 23:18:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-04
MD5: 3b5b31b2eee3f246637560c41a951c3c SHA-1: d64d2accc150e566ac7bd7528ea983d167839c8a SHA-256: f38d164c60216ba7743332ceff5ab8bf95b1d6e6dfbb6becf3fb1c8b6509a676
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Phishing: Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a large number of embedded links, many of which point to suspicious domains. One critical heuristic identified a link to known malicious redirector infrastructure, and another identified a link farm designed for SEO manipulation. The document body itself contains garbled text and a few of the embedded URLs, suggesting it is primarily a vehicle for delivering these links. No scripts were extracted from this sample.

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.cc/wb?keyword=biosecurity%20act%202014%20pdf In PDF document text
    • http://files.wilcoprevention.org/uploads/1/3/1/4/131437740/29b296.pdfIn PDF document text
    • http://files.mcmillanvetclinic.com/uploads/1/3/1/8/131872178/siterixuw.pdfIn PDF document text
    • http://files.meredithkaler.com/uploads/1/3/1/3/131398367/2065088.pdfIn PDF document text
    • http://files.ninelivestwine.com/uploads/1/3/0/8/130874629/vezik_gunefitotokek.pdfIn PDF document text
    • http://files.snohomishvalleyicerink.com/uploads/1/3/1/3/131379320/pubeva-menizekij-patawotosaxos-zagepegimuxed.pdfIn PDF document text
    • http://files.truewealthfg.com/uploads/1/3/2/7/132710687/migejowo.pdfIn PDF document text
    • http://files.artmattersstudio.com/uploads/1/3/0/7/130775275/rawatumawimadix.pdfIn PDF document text
    • http://files.allenfinancialcorp.com/uploads/1/3/2/6/132680955/a3e0e.pdfIn PDF document text
    • http://files.temenosjournal.com/uploads/1/3/1/8/131871762/fosevup.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://wilopag.files.wordpress.com/2020/06/jasofusabevimoneb.pdfIn PDF document text
    • https://viwedibimu.files.wordpress.com/2020/07/23007408526.pdfIn PDF document text
    • https://puwugeboje.files.wordpress.com/2020/06/foniroxajumos.pdfIn PDF document text
    • https://pojesiter.files.wordpress.com/2020/07/23494969694.pdfIn PDF document text
    • https://sevikozomija.files.wordpress.com/2020/06/mitusafu.pdfIn PDF document text
    • https://pubonum.files.wordpress.com/2020/06/65319634379.pdfIn PDF document text
    • https://nuvomisegej.files.wordpress.com/2020/07/63749371613.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/18983443830.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rinavupomun.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/1741554469.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006c59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C59 5460 bytes
SHA-256: 4f6f8fcfa65d147b70b5887216118ef9bda4f48b8dd0aa228635947e2bc3a970
font_01_sfnt_off00007f0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7F0D 9832 bytes
SHA-256: ba1567f71a98e790e1ea6e0b59a80e0c18b7bb778a22d85af668374d3b99391d

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