Malicious PDF — malware analysis report

Static analysis result for SHA-256 34ef3f8994ebf1fa…

MALICIOUS

PDF

69.1 KB Created: 2020-11-02 06:01:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: cb81bc9be8b4e998d17bb7d4fa6875a5 SHA-1: a312040934b57c36238426ba99c42f53c8a3b85b SHA-256: 34ef3f8994ebf1fa411d27cb5ba5ba273caed25a907a6ea138ed1e7b4b3beb40
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains a link that redirects to known malicious infrastructure, disguised as a download for "dirt tracks in illinois". This is a common lure for phishing or malware delivery. The ML classifier strongly indicated maliciousness, and the PDF redirector heuristic confirmed the malicious link. No scripts were extracted, but the embedded URL is the primary indicator of compromise.

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) or Microsoft license-boilerplate documents that carry no urgency or charge/dispute escalation.
  • 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/wb?keyword=dirt%20tracks%20in%20illinois In 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://uploads.strikinglycdn.com/files/57ee11ba-f31b-410e-8851-5b20f16982fb/fepulorilowuwixuzulidow.pdfIn PDF document text
    • https://s3.amazonaws.com/rubidokezive/aircraft_landing_gear_hydraulic_system.pdfIn PDF document text
    • https://s3.amazonaws.com/jezaxojipevu/nosezejitiwosimixa.pdfIn PDF document text
    • https://s3.amazonaws.com/mubemutolewe/20640142096.pdfIn PDF document text
    • https://s3.amazonaws.com/zunewidimem/xerobamumidogug.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/7451/8691/files/definition_of_statistical_question.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca0ee696-3cd7-4ea0-b3fa-204fc51469c6/69922201926.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00315490-a119-42b0-8be3-5a86c9fc6dec/billig_sprit_korsord.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4f9cfbc-7866-4377-951e-86f202ec7e70/custom_weapons_starbound.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4740d10c-e5ea-4aeb-ad9a-669eefdaa3a4/kopitipoxamokatez.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26ed03a4-f39a-4c82-8b07-50bcebdd2999/xobawiwuro.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://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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0000cd1e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xCD1E 26128 bytes
SHA-256: f21218a9413c262934b6770573a551e1719b044e8842c8c06141076eb251dc1a
font_00_sfnt_off0000978b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x978B 4524 bytes
SHA-256: b6fe7334860c5d23715f7a9522ce35adacdf5f1cecfc59a1d7ac65de08beb844
font_01_sfnt_off0000a6e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA6E7 11144 bytes
SHA-256: 71bcfb3dc009eb20d1d661d65e42fce772552686ee03817c97ee6eb328295d2b
font_03_sfnt_off0000f972.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF972 4324 bytes
SHA-256: 781b9fae2fb9201b4a05d2041fea553bb2973f1d011ab9c51e3326c72e342c60

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