Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef5977cf41b1fb68…

MALICIOUS

PDF

46.0 KB Created: 2020-10-25 13:45:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 2d5431b5491f98056967e721eef92c55 SHA-1: 34269628a3e6ff13b7b70a7d17145c031a5c571c SHA-256: ef5977cf41b1fb68d1be86d122b0476f06c2c9f10b29e0c0297dd4421ba2f17e
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a link farm and a redirector URL that is flagged as malicious, suggesting a phishing or malware distribution attempt. The document body text, though heavily obfuscated, contains the malicious URL and references to a 'spanish keyboard android app', indicating a lure. The ML classifier also strongly flagged this PDF as malicious.

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://gettraff.ru/123?keyword=spanish+keyboard+android+app In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366654/normal_5f87629b38259.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382772/normal_5f91cfde8e68d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391903/normal_5f8f072a10b57.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380395/normal_5f8e964c9d17b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366007/normal_5f87d343ee662.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384820/normal_5f8d951c1978a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368496/normal_5f8957ae68ad2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387040/normal_5f9052b5532e2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/4276/4962/files/where_the_wild_things_are_judith.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6873/5140/files/india_vs_sri_lanka_5th_odi_live_streaming_free.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/8028/9956/files/robajukugaber.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/9319/5455/files/naming_binary_compounds_practice_worksheet_type_2.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0478/9174/2886/files/jowufevu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8241/6281/files/31591895892.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b23f84f-247a-40aa-b7e0-c6fd396e7fd8/13599516341.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/16c98fb9-961c-4467-97bb-60281043bf26/nirinamomesabovaruxipi.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_off0000741f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x741F 5424 bytes
SHA-256: 2258ba5fd56a79ecc8193df40228e4655e8e194d406d6fadbb2f3bea6c5ea812
font_01_sfnt_off0000867b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x867B 10992 bytes
SHA-256: e3aa33371a886fb3c9a8ca53b9aab255abc04bd8913f1b9bca26056752e75c6b

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