Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cd638a9afdacfd3…

MALICIOUS

PDF

47.6 KB Created: 2020-07-30 16:01:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 28701f1f10224706d018cc05fe059168 SHA-1: eec0f8f235a102186047bfb2c1a349383962e70c SHA-256: 2cd638a9afdacfd3493e2a3004e457f7177a228a5f359ccd31cd761d39764475
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of embedded links, identified as a 'PDF link farm'. One of these links, 'https://ttraff.cc/pify?keyword=animal+biotechnology+research+papers+pdf', points to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body is heavily obfuscated and does not provide clear textual lures.

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.cc/pify?keyword=animal+biotechnology+research+papers+pdf In PDF document text
    • http://files.sparkybuddy.com/uploads/1/3/1/3/131398259/5146045.pdfIn PDF document text
    • http://files.greatbooksgreatdeals.com/uploads/1/3/0/7/130740571/fujojaw_nirotagewebutoz.pdfIn PDF document text
    • http://files.tugcekarapinar.com/uploads/1/3/1/3/131379312/80fc8.pdfIn PDF document text
    • http://files.castrovilleconservationsociety.net/uploads/1/3/1/6/131606115/3836910.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/1/0431/3258/4098/files/dosowamufubafojiribe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6213/2897/files/78037513355.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/mobisibat.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/0642/5249/files/8272723302.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0417/4233/files/54989213133.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/5049/2316/files/fanatojanidetepulup.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0441/3744/7576/files/96748248709.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/1823/0688/files/83760543303.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/5809/4495/files/falamivumedusexuna.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_off00007b48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7B48 5588 bytes
SHA-256: a7224c0ff3ff9576f57e37d94b964a0cc4282ccabc55e729accc6fc66a3ac954
font_01_sfnt_off00008e0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E0F 10392 bytes
SHA-256: cead5297493f7d0598495c74d223966d8c316961f668646062963da1aa2c7adc

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