Malicious PDF — malware analysis report

Static analysis result for SHA-256 53b44c56949eba0b…

MALICIOUS

PDF

68.3 KB Created: 2020-12-17 00:14:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 088de3d4b682e96f2e6b8a55dabf551a SHA-1: 1d61c2c2094c807a95fac27c60589f0fb8c7d28f SHA-256: 53b44c56949eba0be161322b4e16e4b182d5395645b02c7b7d871896b32f048f
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple links designed to redirect users to external resources, with one specific URL identified as a malicious redirector. The heuristic firings indicate the PDF is acting as a link farm, likely to obscure the true destination and potentially trick users into downloading malware disguised as legitimate software. No scripts were extracted, but the presence of embedded URLs and the ML classification strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://traffking.ru/123?utm_term=flip+master+hack+ios In PDF document text
    • https://vonubaxuted.weebly.com/uploads/1/3/1/4/131452839/fd2adebedd29.pdfIn PDF document text
    • https://farupixin.weebly.com/uploads/1/3/4/3/134314126/rifamobojepima.pdfIn PDF document text
    • https://rezivunafotete.weebly.com/uploads/1/3/4/3/134354631/wopenuvemufe_negakalipujura_betud_tudew.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wopari/bluetooth_driver_free_softonic.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0abc6bda9c57a97bd16fd/t/5fc16edf3c6ccf69f39424bc/1606512351256/mcgraw_hill_guide_to_writing_4th_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9045bf07-8058-4572-bd7b-8cf50858f51d/download_showbox_latest_version_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e97de1d-2fd2-4e04-805e-7bea88d6747a/9325875748.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/820abe65-28ae-46ff-a171-17641f8fb0a1/71144056351.pdfIn PDF document text
    • https://s3.amazonaws.com/zijivevip/9936927438.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5db1bc5e-f2dc-4b61-a050-a8dad2821f8c/vijobumagob.pdfIn PDF document text
    • https://s3.amazonaws.com/busutafitufe/24418782506.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da51a375-70b0-439b-b6f6-8ce4e6bde37d/mizoxotusosiloxe.pdfIn PDF document text
    • https://s3.amazonaws.com/pirofopafu/delhi_metro_map_fare_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b316a654-3fd5-4dfa-bf8c-c2cc83e70ce6/estudos_bblicos_escola_dominical_cp.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/751c0af8-d30a-4f7b-9a32-45c64b5cda2d/simagafuwokusigogubapoxon.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_off0000ce36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE36 5192 bytes
SHA-256: f435b72690139c506945924887a7e4d4058bf01ee4fa6e6b7e781077c7e19933
font_01_sfnt_off0000dfb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB1 10676 bytes
SHA-256: 8423cf72e8c25c207c22a1d8ff60a533750f8d0974b3e54bd28cc1e75281f218

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