Malicious PDF — malware analysis report

Static analysis result for SHA-256 16ac5ae90ae3e537…

MALICIOUS

PDF

56.6 KB Created: 2020-08-10 00:32:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: df5f1ffd5a003ed65142c47a043b2b5e SHA-1: 7dd230c39a37920eda57a1ae3fdb499fc39384bb SHA-256: 16ac5ae90ae3e537c7d842336c518f7f7ad7cfe7e0e2fd74ac39740877a635cc
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many of which point to a redirector service (ttraff.com) that is known to host malicious content. The document body, though heavily obfuscated, contains the same redirector URL and other URLs that appear to be part of a link farm designed to improve search engine ranking for malicious content. This suggests the document is intended to trick users into visiting malicious websites, 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=skinner+box+experiment+pdf In PDF document text
    • http://files.missladytweet.com/uploads/1/3/2/7/132712323/sabawomorixa.pdfIn PDF document text
    • http://files.scfoodaccess.com/uploads/1/3/1/8/131856158/gezelotonixoz-nojefirimaputag-bulipo.pdfIn PDF document text
    • http://files.w4mtp.com/uploads/1/3/0/7/130739789/jibudusefa-lapax-pakojenakikivaw-xusuxagiti.pdfIn PDF document text
    • http://files.lunaintegrations.com/uploads/1/3/0/8/130874379/jabuxibevoridup-xudutaj-xuwonubeg-xogiveri.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/1/0435/2344/0792/files/45106490972.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/7443/5737/files/cell_structure_and_function_notes.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2868/4701/files/3400523514.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/5198/3783/files/toastmasters_cc_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/0510/0707/files/jojotepulodixulesobakutog.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/7974/6201/files/guwoluxasa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/4288/0160/files/86455313904.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6761/3089/files/xedexonuzenaruluzosizasur.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/3113/3340/files/42908519070.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/81599599528.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/2132/8807/files/27713544685.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_off00008177.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8177 5144 bytes
SHA-256: 4811a66c4700e83ffaaf10f31938e5e763c303a70d419b2a1f69c378a33a4f1f
font_01_sfnt_off000092e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x92E9 14448 bytes
SHA-256: 7865bead38eb4b9154d157015196f4998ed02712b99b426bf0b70f63ca72e42f
font_02_sfnt_off0000bff0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFF0 16164 bytes
SHA-256: c41fc46809d2260d2d1a821cef6bb00dae560fdbad380da94a93f29d012df54e