Malicious PDF — malware analysis report

Static analysis result for SHA-256 53cf68b8fe6341e6…

MALICIOUS

PDF

56.4 KB Created: 2020-08-10 21:24:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: b3b9d93f367ee9d2713f5d0838615b0d SHA-1: c2fe3e0bd859732996e3b2687dba7bb9fc0fd609 SHA-256: 53cf68b8fe6341e65db589b68c1a503dec3149adca3fd1dd0089084d53290f89
194 Risk Score

Malware Insights

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

The PDF contains a mass of external links, with one prominent link pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the target URL and appears to be a lure for a document related to 'agarose gel electrophoresis'. The presence of numerous PDF links, many hosted on Shopify, suggests a link farm or SEO poisoning tactic to distribute malicious content. The ML classifier strongly indicates 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.com/pify?keyword=agarose+gel+electrophoresis+practical+pdf In PDF document text
    • http://files.nic-hunter.com/uploads/1/3/1/1/131164250/4021025.pdfIn PDF document text
    • http://files.riverdeepimagery.com/uploads/1/3/1/4/131409309/xizokawa.pdfIn PDF document text
    • http://zixarari.eclipsegamingsupply.com/uploads/1/3/1/3/131381204/lulivawoli.pdfIn PDF document text
    • http://puxem.guanjen.com/uploads/1/3/0/7/130738970/nefumuguwin_xapusimefoguv_nusenogorezonig_xemapuduvuzozi.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/1/0436/8292/2646/files/85916238280.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/9107/4976/files/nevuduzedux.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/1681/2706/files/joelle_van_dyne.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0448/0968/3106/files/argumentative_essay_rubric.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0447/7586/6519/files/utilization_of_aromatic_plants.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9656/4131/files/42130306057.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/8079/4790/files/wumofubi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/8734/0454/files/subav.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/5800/4117/files/29028022606.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/3140/3423/files/asperger_syndrome_diagnostic_scale_asds.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7144/6939/files/68474404591.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1935/3757/files/muguxipewumunobug.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0441/0084/5720/files/70533840920.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 3

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_off00009dd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9DD8 5408 bytes
SHA-256: 5997e5d80dfe0b9332b379ac69d38f8cb3c840f84e83bd8e549b49f4c98c6aad
font_01_sfnt_off0000b033.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB033 10668 bytes
SHA-256: 1183c1a04ac6aa3cf8d4e3528705d47597b4361e325c23b8f194597480eea153

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