Malicious PDF — malware analysis report

Static analysis result for SHA-256 81f0714740ca9b33…

MALICIOUS

PDF

42.0 KB Created: 2020-08-25 23:52:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-07
MD5: 03311e96715a46d3dbb543d2c12c5cf6 SHA-1: 2906ea983aa7cbbbf0338e284539a94ae662f19f SHA-256: 81f0714740ca9b33ea49bc73cdb588941a1d1b53eac54a343e02533008e11aa1
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links, many of which point to a redirector service known for malicious activity. The document body, though heavily obfuscated, contains text that appears to be a lure for users to click on these links. The ML classifier strongly indicates maliciousness, and the presence of a redirector URL suggests an attempt to lead the user to a malicious site, likely for phishing or malware distribution.

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=ruby+tuesday+new+orleans+seafood In PDF document text
    • http://files.naturallynickelfree.com/uploads/1/3/0/8/130874012/gutivona-kejero-laxijubu.pdfIn PDF document text
    • http://xorew.tohsthecenter.org/uploads/1/3/0/8/130873998/derepeweriki-jufovid-kasudizob-wevakinuboje.pdfIn PDF document text
    • http://jefuk.jimfitzsimonsphotography.com/uploads/1/3/2/8/132815793/jefelinoridu.pdfIn PDF document text
    • http://sazil.annapurnasriram.com/uploads/1/3/2/6/132682646/vumej.pdfIn PDF document text
    • http://zexubata.fleenorfamilyadventure.com/uploads/1/3/1/4/131453501/xuponadarate.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/1/0439/2786/3464/files/love_stage_episode_1_eng_sub.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/1172/5723/files/rufuviwekubevifanofo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9378/6791/files/8244715030.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5351/3893/files/critical_thinking_books.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/1152/9114/files/lewusozijuvilolip.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5676/6869/files/jolemepifidowirapewulagit.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/4246/4163/files/sikub.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1338/9992/files/senetuxatuj.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0563/9836/files/82437376459.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6180/4198/files/gegutikezotetelaxoli.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5657/8212/files/77451670633.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/1714/0386/files/visual_boy_advance_roms.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000050dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x50DC 5240 bytes
SHA-256: 7cffe57ffe366d6479499ce30d60746bf6e656efe55e22d1edac7853b06c9fcf
font_01_sfnt_off000062cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62CF 10248 bytes
SHA-256: 732e26ef29275c7146673c99c1288f967b33451a12e82a6007e2c6a825e72007
font_02_sfnt_off00008622.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8622 16096 bytes
SHA-256: 74c40f4c9de6c7c77e92d90278be04d04ba19a5b7de7d81afa27d5744c1b30ee