Malicious PDF — malware analysis report

Static analysis result for SHA-256 20fdc39d9df46546…

MALICIOUS

PDF

43.2 KB Created: 2020-11-07 02:16:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: c16e5a363dbd5e8aad32aab9c069bfca SHA-1: 3c69181225012fd5ce99a96897fa8d66bf9a2676 SHA-256: 20fdc39d9df465464a455c3f957ffbad1c199b7c130636b5d0a9daa307b785a6
142 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 links to known malicious redirector infrastructure, specifically for SEO-based lures like 'free-download phishing'. The document body, though heavily obfuscated, contains a URL that matches the malicious redirector. This suggests the file is designed to trick users into downloading software via a malicious link.

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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=apk+gta+4+download In PDF document text
    • https://cdn-cms.f-static.net/uploads/4406820/normal_5f9265dd95c69.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380210/normal_5f90eb8af2a35.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369317/normal_5f989cb2f0041.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/d123e497-beb2-4dd9-ac10-cb6456a715e4/figesosajivatimuvoroxiw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd14460f-1614-4e2a-aa33-f62931594a59/61966902428.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31e9f6dc-b585-4c6f-92c3-53f26856d13f/rockman_4_minus_infinity_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/889ae983-ecf7-4db0-a757-dbdc2130bd3f/lug_ripper_autozone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5169dc6d-30a9-4a62-869f-eabef87ac9f9/8560388403.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79ef02cb-ddc7-4905-91b8-2e591f75e6e7/jubapeka.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f98ff05-62a5-4410-aa19-d50bee4ceed0/39889390239.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b67586dd-de8b-4cc2-8f10-76d506caa7fa/28042790287.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1856453-f666-45f3-98fc-bc4415be7d3b/papa_louie_burgeria_mod_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e961aa86-841e-48b7-8e4f-1272df9fad79/49828907890.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/997b547f-166c-40ef-82c0-26e9c1a77d1e/watch_american_gangster_2007_online_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59744a6f-65ff-4caf-8087-a8b9b5960805/7319370551.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_off00006902.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6902 5088 bytes
SHA-256: 057d4a2d5ca5e94c484f140bfa4d153eb4ee97f0a1b1d5b8a3fa4524a81073f2
font_01_sfnt_off00007a86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7A86 11040 bytes
SHA-256: b61a03dd326cc118034304ea189ef05c6b5ecda2bb6bf3af7b7b63ca1f464468

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