Malicious PDF — malware analysis report

Static analysis result for SHA-256 f31b018ec02150c2…

MALICIOUS

PDF

36.5 KB Created: 2020-08-08 12:38:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: c863509edd39783bd9cac4793d596c17 SHA-1: 05fc4f5454c4ed4135f4ea6af7e0aa61c41cee84 SHA-256: f31b018ec02150c24dfc025d22116654453af41c72ea8af5ed2710c7a7f2fc2a
194 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with the primary heuristic identifying a link to a known malicious redirector. The document body, though heavily obfuscated, contains text that appears to be a lure for a "Trojan horse" PDF download. The ML classifier strongly indicated maliciousness, supporting the conclusion that this PDF is designed to redirect users to harmful sites.

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=caballo+de+troya+1+jerusalen+pdf+descargar In PDF document text
    • http://files.michellexiao.net/uploads/1/3/1/6/131607346/xugex-xotosuzunixovir-kuvareduxifo-fufetatarifu.pdfIn PDF document text
    • http://files.prigitalsolutions.com/uploads/1/3/0/7/130775441/gufaberejud-jufonawav-wixapevaba-gotikex.pdfIn PDF document text
    • http://files.coorain.com/uploads/1/3/1/3/131379894/9760699.pdfIn PDF document text
    • http://sogamal.turnbullphotographyart.com/uploads/1/3/1/4/131453574/9be87110b991732.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/1/0431/0204/4316/files/how_to_push_project_to_github.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/2598/7741/files/23069800674.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/3732/5462/files/34379374814.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/6995/5486/files/3280134924.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/8679/1334/files/rutotilivubuzanut.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/5249/1159/files/virobavozejuta.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8611/1137/files/42228906689.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7354/4093/files/babcock_and_wilcox_boiler_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/gojifazuxosupimuron.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3179/7668/files/segokasivapatanixorax.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/9762/9596/files/92112531282.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_off00004c2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4C2D 5600 bytes
SHA-256: 005a7ad2d304b047077446a1157d95b1c6f707371d84241136d8ed2749a56be2
font_01_sfnt_off00005f54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F54 11004 bytes
SHA-256: bc091956ce53b072e0fbb40b5367fec2de4a60d45eea006e561e767cf0188950

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