Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5c75c2f4ac2f097…

MALICIOUS

PDF

42.9 KB Created: 2020-08-09 21:04:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: f471ab367e813a5440a92d10afd13003 SHA-1: afc42f04a3a527c1a338a19519962eebe0375913 SHA-256: d5c75c2f4ac2f097f6981fae084523d44d68de868bec83e86727e008423d3523
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded links, including one pointing to a known malicious redirector at ttraff.com. The document body, though heavily obfuscated, appears to be a lure related to interview questions, intended to trick users into clicking the malicious link. The ML classifier strongly indicated maliciousness, and the PDF structure suggests a link farm designed for SEO manipulation to distribute malicious 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=interview+questions+and+answers+on+data+structures+for+freshers+pdf In PDF document text
    • http://files.adriangoldberg.com/uploads/1/3/1/0/131070072/c5daedb85484.pdfIn PDF document text
    • http://japubaru.ninepoundcatfish.co.uk/uploads/1/3/0/8/130874493/4575346.pdfIn PDF document text
    • http://files.josephpkelly.com/uploads/1/3/0/7/130739122/aec861cf.pdfIn PDF document text
    • http://files.lilacvillagebb.com/uploads/1/3/1/8/131871621/didajisobepufe.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/1/0439/0807/1576/files/jikalo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/9883/2037/files/64683046767.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6939/9452/files/jafuzodupotixadiveg.pdfIn PDF document text
    • http://files.mesweeney.people.ua.edu/uploads/1/3/2/6/132682829/komime.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8720/0418/files/32278784205.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/niborenegukudokeregus.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/3651/5224/files/bijinazedebiruxotoradoza.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8946/1410/files/aditya_birla_health_insurance_premium_chart.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/2194/9335/files/zoxobuluvemizuviz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/1021/2519/files/46636873372.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 4

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_off000068bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x68BD 5424 bytes
SHA-256: 5fa07c2463cfd4c0451ac878621048901d5f2c5e80bc719f8337f722f56f8fbb
font_01_sfnt_off00007b42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7B42 10152 bytes
SHA-256: 411f3d9e24cc1a1ab59cae26bfa06b915e5d4f672e614947d2242eec9fd5ef72

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