Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c3d33095b7e9794…

MALICIOUS

PDF

41.2 KB Created: 2020-11-01 17:34:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 7f0b9b6a0b20170e7923fb1a3f0a14a2 SHA-1: 98538f821ea4559447dd6a683323443abecc9c6c SHA-256: 4c3d33095b7e9794dbd646557354a2597f010a7695288a1767cd9e7b27188845
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file contains numerous embedded links, many of which point to a redirector service (ggtraff.ru) that is known to host malicious content. The heuristic PDF_SEO_LINK_FARM indicates a large number of external links, suggesting an attempt to manipulate search engine results for phishing or malware distribution. The presence of the URL 'https://ggtraff.ru/strik?keyword=cydia+android+apk' strongly suggests a lure related to app downloads, likely a phishing attempt.

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.
  • 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.
  • 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=cydia+android+apk In PDF document text
    • https://loxuvamozevu.weebly.com/uploads/1/3/4/3/134310095/jidam.pdfIn PDF document text
    • https://bujezabuzi.weebly.com/uploads/1/3/4/3/134310034/1501ef27.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/2454fa6b-b1db-4c6e-b8f2-caf00940430f/symbolism_worksheet_8th_grade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2377d80-59fb-4c1b-a53c-5c7464ec1782/realtek_pcie_gbe_family_controller_best_advanced_settings.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c25fc73d-10c3-49d0-a011-77489b9c749a/62539852432.pdfIn PDF document text
    • https://s3.amazonaws.com/xedobox/watch_rio_online_123_movies.pdfIn PDF document text
    • https://s3.amazonaws.com/wuzalugiseto/learn_korean_books.pdfIn PDF document text
    • https://s3.amazonaws.com/jukezeluf/age_word_problems_with_solutions_in_algebra.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94b961e6-ef55-4f26-aad0-86bdc700f74d/hb_sports_discount_code.pdfIn PDF document text
    • https://s3.amazonaws.com/bodepova/lg_442bg_tracfone_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/6827/2039/files/observation_forms_for_instructional_coaches.pdfIn PDF document text
    • https://s3.amazonaws.com/lupuvogotog/evaluation_a_systematic_approach.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6fec8863-2d4f-45c8-ab0a-6a0c3236ec7d/8768563713.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_off0000616d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x616D 4812 bytes
SHA-256: 60360545c333fff795f1acd094870a86a74f39ac4beb0aded4e053d4531721b3
font_01_sfnt_off000071e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x71E2 11368 bytes
SHA-256: 097d11d6d5789b572a0e4cbc94e2ddb633a6a3b85a21f25360862f809cb83055

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