Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d9db2afe388769d…

MALICIOUS

PDF

48.4 KB Created: 2020-08-21 08:23:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 47d91d25f54f5b00af2c346ea547a03d SHA-1: 23a46a6cab89f29f899152d53aa21598bb530f34 SHA-256: 1d9db2afe388769dd5ad06ef3f0b172231f54c3bd6726236bf029eea7be283da
194 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, which is the primary mechanism for luring the user. The document body, though heavily obfuscated, contains text related to a 'centrifugal pump preventive maintenance checklist' and the malicious URL itself. The presence of numerous external PDF links, many hosted on Shopify, suggests a link farm or SEO poisoning tactic to distribute the malicious document. The primary malicious URL is https://ttraff.cc/pify?keyword=centrifugal+pump+preventive+maintenance+checklist+pdf.

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=centrifugal+pump+preventive+maintenance+checklist+pdf In PDF document text
    • http://files.cullomptonartshouse.org/uploads/1/3/1/3/131379213/3515541.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0486/2374/files/9763839140.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7492/0347/files/tratamiento_de_anemia_en_el_embarazo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8186/7176/files/rugufun.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7818/8198/files/bcg_company_presentation.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3913/7697/files/laperomofumasokiz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4241/4487/files/amplitude_modulation_using_matlab.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/87932640634.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/5939/4213/files/29801113951.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5018/0503/files/49643749276.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/1742/7352/files/logic_games.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 1

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

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000709f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x709F 5488 bytes
SHA-256: 95f3aec2fffb98bbe907aa501841cb94afaf04ebcf121a7cd9214b6e199f8973
font_01_sfnt_off0000831f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x831F 10148 bytes
SHA-256: 504f847b510940778b8f7fb3eafaeaa6f39771bd54bb0afa176216fb5cd91399
font_02_sfnt_off0000a5d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA5D7 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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