Malicious PDF — malware analysis report

Static analysis result for SHA-256 16778c6fde1cbf7c…

MALICIOUS

PDF

125.2 KB Created: 2020-07-31 13:13:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 4e9072bf46dec115d0938fff533ecf4e SHA-1: 181c4c6b6503f588bd03741ae448082572a3a35a SHA-256: 16778c6fde1cbf7c44bb803fc50fa32348f06f82feaff65dad7ed02bcf5b3ac0
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, with a critical heuristic firing indicating these links point to known malicious redirector infrastructure. The document body, though heavily obfuscated, appears to be a lure related to 'bridging and bonding social capital'. The primary malicious IOC is the redirector URL, which is likely used to funnel victims to phishing sites or download further malware.

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=bridging+and+bonding+social+capital+pdf In PDF document text
    • http://files.andersonolineacademy.com/uploads/1/3/2/7/132740978/vulutaduk.pdfIn PDF document text
    • http://files.biggulpcastnets.com/uploads/1/3/0/7/130739415/nusujemewi-faran-zijubejatawuga.pdfIn PDF document text
    • http://files.learningsupport.shenfieldlearning.com/uploads/1/3/0/8/130874026/terif.pdfIn PDF document text
    • http://files.lifewisegifts.com/uploads/1/3/0/8/130874128/6ab8d3.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/1/0435/3890/7288/files/47747383489.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/0877/0726/files/12186340651.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9073/0405/files/65902374526.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0565/6736/files/zikegaraxokudoro.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0623/8613/files/6132449663.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/7215/1959/files/togobojome.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0343/6446/files/36229803682.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3095/3630/files/34367823097.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/2881/4746/files/83792507132.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/7973/8278/files/sewopewodolirutozefa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/3346/7808/files/26128525680.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_off0001a7ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A7FF 5180 bytes
SHA-256: 20ecb7cc3716411211c78dced9bad39e3917e6e143967a700a92b9dbfad2b5ee
font_01_sfnt_off0001b995.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B995 14532 bytes
SHA-256: 1195a652c0715eecca9ba69d42cd354b315071a42170c08e89e1d59f36cc5a59

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