Malicious PDF — malware analysis report

Static analysis result for SHA-256 98f426d8f64f555e…

MALICIOUS

PDF

101.3 KB Created: 2020-08-03 18:48:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-07
MD5: 18ba2793f27e54a5f9ac36795cfca04b SHA-1: cea680c80a0835a40201c4f1aabe9805535c516b SHA-256: 98f426d8f64f555e5292daf575d9828c5586baa0c074af950c3a9f5c3cab99c1
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains numerous embedded links, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the URL 'https://ttraff.ru/pify?keyword=cell+culture+methods+pdf', suggesting a lure for users searching for 'cell culture methods pdf'. The ML classifier strongly supports maliciousness.

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=cell+culture+methods+pdf In PDF document text
    • http://files.cheongjuguide.com/uploads/1/3/0/7/130776031/wovuworivesobaw-retevibebo-duwesul-jedamikiresapes.pdfIn PDF document text
    • http://files.seattosleep.co.uk/uploads/1/3/1/6/131606122/rikigubom.pdfIn PDF document text
    • http://files.cuesign.org/uploads/1/3/1/3/131384335/f80d1c.pdfIn PDF document text
    • http://files.amyfreeman.net/uploads/1/3/0/7/130775462/bupazatonosajuk.pdfIn PDF document text
    • http://files.nationals2020.com/uploads/1/3/1/4/131483249/698336.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/1/0437/7319/8497/files/fetojekuxaz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/2634/1272/files/dogevusesagevetilisiw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6628/6490/files/dazorud.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/3733/3406/files/60596479498.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/2929/1427/files/10314007757.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/8909/8907/files/sivebeba.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9573/6988/files/dudewesefibetu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0002/0635/files/53997930000.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/6881/5528/files/fallout_76_perk_chart.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/3680/3233/files/76352642744.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8305/4757/files/60584631589.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/5085/0709/files/xevulesad.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

Related samples 7

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_off000147c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147C5 5092 bytes
SHA-256: 5c9d9d40e9d7154c091c35d5f163350beeb85ba76afe8dcfc6fe0c5af1d6162a
font_01_sfnt_off000158e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158E7 15120 bytes
SHA-256: bcaa9add5c7b40050f21feb69da3d373e8b440470e476051616d4b2f90f073fc

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