Malicious PDF — malware analysis report

Static analysis result for SHA-256 16b03c3eeaf535b4…

MALICIOUS

PDF

36.3 KB Created: 2020-08-10 03:15:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: dda20914f532eaf3c4d05729d39e053b SHA-1: 3bfba6f399ae05050a3d705be5dc1c81e1cd6b01 SHA-256: 16b03c3eeaf535b429f1b763af3944bd35b6e35783d49a6a3d8e298234b1ba07
194 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to redirectors and SEO-optimized PDF hosting sites, indicating a link farm designed to attract clicks. The primary redirector URL is https://ttraff.cc/pify?keyword=nicomachean+ethics+irwin+pdf, which is flagged as malicious. This suggests the document is part of a phishing or malware distribution campaign, likely using the lure of free downloads to entice users to click malicious links.

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=nicomachean+ethics+irwin+pdf In PDF document text
    • http://files.usatoyfactoryaustin.com/uploads/1/3/0/9/130969632/bemigud.pdfIn PDF document text
    • http://zevifu.jennysdelights.com/uploads/1/3/1/4/131453540/mefikotewunuj_jojudotewase.pdfIn PDF document text
    • http://files.damesdynastyleauge.com/uploads/1/3/0/7/130739234/lubururosugo-riwudi-zulebuves-pudilorewote.pdfIn PDF document text
    • http://roniluw.cuming-klassenclassroom.com/uploads/1/3/2/6/132681556/248e465d9cd.pdfIn PDF document text
    • http://files.gubds.com/uploads/1/3/1/8/131856170/jokejobidomidof.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/1/0428/9835/8432/files/baludugosutagaxoreforodul.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9754/7157/files/meghan_trainor_i_love_me.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/5407/8871/files/nuweruwedabugenijini.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9599/9129/files/pebanunupuvubedaxu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0410/8711/files/variedades_linguisticas_del_ecuador.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/9967/5040/files/faduzorusipumax.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4495/3509/files/binomial_distribution_solved_examples.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/3646/5559/files/canon_imageclass_mf3010_service_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/3385/4103/files/26851632832.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/8085/2383/files/54135686266.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/5725/9420/files/volabodakomelewun.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/3680/2204/files/banach_space_in_functional_analysis.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5622/5688/files/29477072021.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004ff0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4FF0 5424 bytes
SHA-256: 9bf40f4c877385f7d4449996e26df5682151eb7d544693120a6e176f6550d5be
font_01_sfnt_off0000624d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x624D 9880 bytes
SHA-256: 78cbfc91c31ec12d72b1b4b0a646ad780db1d8db4651fab0e8e90213c35dc015