Malicious PDF — malware analysis report

Static analysis result for SHA-256 16f2ead6757ce398…

MALICIOUS

PDF

44.8 KB Created: 2020-07-31 11:39:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: bec4099fa2bba83f2a2ae74dba72ace3 SHA-1: 4abfb1a38212aece297ac654c11a88291d7021be SHA-256: 16f2ead6757ce398cf52327eaf0a3214dfaee18bb7887b0c13896d5c6ff249fb
194 Risk Score

Malware Insights

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

The PDF file contains numerous links designed to appear as free downloads for educational materials, but they redirect to a malicious infrastructure. The primary redirector URL, 'https://ttraff.com/pify?keyword=differential+calculus+by+gorakh+prasad+free+download+pdf', is flagged as malicious and part of an SEO link farm. This suggests a phishing or malware distribution scheme disguised as legitimate content.

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=differential+calculus+by+gorakh+prasad+free+download+pdf In PDF document text
    • http://files.rhearuben.com/uploads/1/3/1/0/131070166/3771581.pdfIn PDF document text
    • http://files.partnersinhopeusa.org/uploads/1/3/0/7/130739234/gilaberix.pdfIn PDF document text
    • http://files.annalisereinhardtphoto.com/uploads/1/3/0/8/130874431/620f78c6de76b9.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/1/0434/8638/0189/files/kabedizovubife.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4836/1375/files/mesanusatu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/8642/0893/files/bazegojig.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3000/3358/files/6009591790.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9426/9333/files/86580854491.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5496/4637/files/kasesikadajefasa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8277/6725/files/13260044066.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7703/3372/files/94716720738.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/1926/3397/files/visimuguze.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/5949/5590/files/xipawebogorava.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/9966/8121/files/40772252487.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_off00006f99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6F99 5696 bytes
SHA-256: 96d33484a0852e905ec2247ac0d9d8f32762be083da11005293056e0f2ee191c
font_01_sfnt_off0000830d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x830D 10208 bytes
SHA-256: 48c7c9d8c47a78229bf5a9b5f41dc61043306f761f687c78289bccff42a444b3

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