Malicious PDF — malware analysis report

Static analysis result for SHA-256 af71c09e06b131b4…

MALICIOUS

PDF

38.6 KB Created: 2020-11-09 00:33:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 6b60353a49dab20bdffd2d812d4fbef0 SHA-1: b5f6a2c8c0c9e5fca857a9d26d86c74edc8a588a SHA-256: af71c09e06b131b487abf206addbf8def72a0a15b5feb7b4bf4e2e5256ebfe7e
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded links, with one specifically pointing to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. The document body text, though heavily obfuscated, contains URLs that are consistent with link farming or phishing lures.

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://ggtraff.ru/123?keyword=music+lab+melody+maker In PDF document text
    • https://firedisivimi.weebly.com/uploads/1/3/0/9/130969818/zegafokoka_rubixorume.pdfIn PDF document text
    • https://jonukejunuxesa.weebly.com/uploads/1/3/1/4/131409236/nazepapoleser-kebugefe-temuxaporazoj.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/e3237933-0f57-4db2-9751-f9ce95953e6e/lion_king_clip_art.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8df0719e-f574-4e90-9e5d-0a4af0a82746/18047922410.pdfIn PDF document text
    • https://vivader.files.wordpress.com/2020/11/vujononinevivasutotisuw.pdfIn PDF document text
    • https://kuvusetile.files.wordpress.com/2020/11/pastor_ron_phillips_wikipedia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/096c6630-12c1-4f86-8d09-aa33f75686a8/22449412973.pdfIn PDF document text
    • https://jasobegofur.files.wordpress.com/2020/11/vibijapulorix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4bb499af-1bec-499a-8d7f-902195585c6e/deguwa.pdfIn PDF document text
    • https://s3.amazonaws.com/pomaxa/pupupabakajuva.pdfIn PDF document text
    • https://senaxaxibele.files.wordpress.com/2020/11/kumujeban.pdfIn PDF document text
    • https://s3.amazonaws.com/domegagowevag/bankers_adda_static_gk_capsule.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d10594c2-5306-4b82-8228-d6028f32f9b8/roblox_card_codes_redeem_generator_unused.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_off0000578b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x578B 5396 bytes
SHA-256: c1aebf0536c3f38aa1a835a3b67a1263b6892990dd8ba6fa8bb5100919d5701b
font_01_sfnt_off000069e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x69E3 10356 bytes
SHA-256: 264093db890a60dec71563baeb4f3201aef889fb5bd5f97339d1f655ec03999a

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