Malicious PDF — malware analysis report

Static analysis result for SHA-256 861c6d52085c24af…

MALICIOUS

PDF

42.8 KB Created: 2020-11-03 06:48:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: fd65eb706913a2de9ab08b9a4ff78abf SHA-1: 38c1ef2565fbc1f8c12d9689589eeca65f0bec2e SHA-256: 861c6d52085c24afe2e8d7654345dd1c3309fbc8994753c68870a1ed18ba379d
134 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains heuristics indicating it's a malicious redirector, specifically designed to lure users with a fake 'review guide' to a malicious URL. The ML classifier strongly supports this assessment. The embedded URL, https://cctraff.ru/123?keyword=ap+macroeconomics+review+guide, is the primary indicator of compromise, likely leading to a phishing or malware distribution site.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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://cctraff.ru/123?keyword=ap+macroeconomics+review+guide In PDF document text
    • https://cdn-cms.f-static.net/uploads/4375889/normal_5f8cc5205912f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377407/normal_5f8eda8bb1abf.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/6770abe1-680a-4e9a-a830-e709508fc23b/ethicon_knot_tying_board.pdfIn PDF document text
    • https://s3.amazonaws.com/fajixe/69709629364.pdfIn PDF document text
    • https://s3.amazonaws.com/xalasawu/gekuse.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c759add-a645-468f-a524-65d185bfafbc/16720845105.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e71f189-1443-49be-ab76-f0dae55ca323/nezezimufesokapalusodisos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/920fcefd-234a-485f-a10c-885bee68a739/wuzawon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9dada49f-e656-4c91-ae8e-d078ca21e305/7_day_notice_to_pay_or_quit_nevada.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d2387ab-024a-4178-b039-2a8b4a0c218a/forced_womanhood_magazine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6c4e26b-62e4-4c35-a3e9-3b7a0b77efec/72534297007.pdfIn PDF document text
    • https://s3.amazonaws.com/bifamomove/31066537517.pdfIn PDF document text
    • https://s3.amazonaws.com/mawesenasijoser/showbox_for_android_download_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2588241-d2aa-4628-accb-46ebcc12f4a6/kalodalumokub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6206e06d-03eb-4f66-9e78-83fca50a3cf5/kegijexewor.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_off000068f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x68F1 5504 bytes
SHA-256: 77855ccac9e1b16854f3d9d0db020784f0c0358b4c2b70d3cae622243f980552
font_01_sfnt_off00007ba2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7BA2 10148 bytes
SHA-256: 40f182591af3141e2e0cca88780fbeafe826b768fa5add8b62974f34314224f8

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