Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c99dd3bda91ef1b…

MALICIOUS

PDF

40.0 KB Created: 2020-08-20 02:28:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: bdb5170a5cd7881a35c86b050d5455c4 SHA-1: e55bc7f99a2616a9b63d8a02a2936ea21c274175 SHA-256: 8c99dd3bda91ef1b23dcf8fb1d9a3e3d03d843ca3a7814cfe08afe84ccbd0bbc
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, with one pointing to a known malicious redirector. The heuristic firings indicate that this PDF is part of a link farm, likely intended for SEO manipulation or to distribute malicious content. The ML classifier strongly supports the malicious verdict.

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://ttraff.ru/pify?keyword=chemguide+dehydration+alcohols In PDF document text
    • http://nevis.manchesterctpal.org/uploads/1/3/1/6/131607600/tizoruwagum.pdfIn PDF document text
    • http://files.speakingofveganfood.com/uploads/1/3/2/7/132711999/9796.pdfIn PDF document text
    • http://files.mystartjournal.com/uploads/1/3/1/6/131637136/sepazejituled-gewopi-zazipolajum.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/1/0431/7793/5004/files/screen_record_mac_with_audio.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0454/0373/4184/files/cambridge_primary_english_activity_book_stage_6_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/4944/1688/files/norigoxupivifenel.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/4020/9056/files/mulabuziremepos.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6255/0940/files/standard_bolt_size_chart.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/8134/3900/files/zedewidikefupezemilon.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/3741/5831/files/wazuvovewe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/3000/2336/files/12240090116.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4155/3575/files/2nd_edition_monster_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/3209/1546/files/add_text_to_google_chrome.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
🗂 Part of campaign: apriloliviaroskos.com 6 samples

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005ff6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FF6 5360 bytes
SHA-256: 738c080d5545e632eac09cc87b0d81987abf90f24ea641560c27468a17976c21
font_01_sfnt_off0000720f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x720F 9940 bytes
SHA-256: 8d6051387e9e746443dbe7a7f1de4f1c1778be435a48b652bc836bc3b959dc05

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