Malicious PDF — malware analysis report

Static analysis result for SHA-256 4be146ad7dd72738…

MALICIOUS

PDF

44.0 KB Created: 2020-08-19 05:27:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 8875f5d563a0f4812d3c4886252ae6b0 SHA-1: 5779c8da8806fd564de192dec821b4c0f626a8d3 SHA-256: 4be146ad7dd72738c8453cf78e97bb287dc47caf19d043270a00d157fe082b10
194 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to external resources. One critical heuristic identified a link to a known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text related to 'ad blocker' and includes the malicious URL, suggesting a lure to a malicious site. The presence of numerous PDF links also indicates a link farm, a common tactic for SEO poisoning or distributing malicious content.

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=best+ad+blocker+android+2018 In PDF document text
    • http://files.reannhuber.com/uploads/1/3/1/3/131383467/jalelatuvorew.pdfIn PDF document text
    • http://files.oneworldtraveler.net/uploads/1/3/1/4/131407552/resivizuf-xegepo.pdfIn PDF document text
    • http://files.raleighgroomingacademy.com/uploads/1/3/0/8/130814169/fizuta.pdfIn PDF document text
    • http://files.edinburghtabletennis.com/uploads/1/3/2/8/132815123/zutiveted_namamop_muvuzej.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/1/0431/3474/6790/files/semaved.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9826/8065/files/50107143113.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/3457/3991/files/surutenasejusapadu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/3842/5767/files/92486208575.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9888/9621/files/tutixarawegoxivalof.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3642/5883/files/1422826866.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6084/7007/files/catalogo_asco_valvula_solenoide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0906/4607/files/delhi_metro_map_pink_line.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/9821/7374/files/bemagifexizisasawi.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 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_off00006c60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C60 5708 bytes
SHA-256: e9d4b1b00f86ad7566d79b3aac44b12d5c88f2c89a4fdea2e5abad4fc432514d
font_01_sfnt_off00007fd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7FD2 10472 bytes
SHA-256: b67739e955341fc9b11e7878f3eaa8cd61b7c9e652617f77e265cfb548796b6a

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