Malicious PDF — malware analysis report

Static analysis result for SHA-256 21b8471879b888a8…

MALICIOUS

PDF

38.8 KB Created: 2020-08-12 16:59:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: c097a35a31d64dc40c9c61eacaedf4ad SHA-1: 1a5278dd9aa0ce6a5028415e1fe67c1f3f9d32b9 SHA-256: 21b8471879b888a8f4ae42f08fdd1ee893deb355200eacd6723c7db7d6c51724
194 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with a primary malicious redirector URL disguised as a legitimate document title. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK firing confirms that the link at https://ttraff.com/pify?keyword=clinical+hematology+atlas+3rd+edition+pdf leads to known malicious infrastructure. The PDF_SEO_LINK_FARM heuristic indicates a large number of outbound links, many hosted on Shopify, likely to improve search engine ranking for 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=clinical+hematology+atlas+3rd+edition+pdf In PDF document text
    • http://lanewupe.lashupbrowdown.com/uploads/1/3/1/3/131398097/kuzezoguxevuxuzika.pdfIn PDF document text
    • http://files.nxtgenerationenergy.com/uploads/1/3/2/7/132740415/sodegebu.pdfIn PDF document text
    • http://bemutowu.ivneglobalservice.org/uploads/1/3/0/8/130873851/kajubidug_jogufu_nugugob.pdfIn PDF document text
    • http://files.mcnaacp6304.org/uploads/1/3/1/4/131453248/wiveduno_rejusanuxumaje.pdfIn PDF document text
    • http://files.tempestuous.ca/uploads/1/3/1/1/131164476/febijuxut.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/1/0434/6265/6152/files/jisuwibowut.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2322/0392/files/actuarial_science_uct.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8375/9765/files/86794438253.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/welilavuruwad.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/1460/1378/files/kabeniso.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2924/9694/files/dr_demento_christmas.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7976/1061/files/fekoke.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3006/0955/files/sukupukinelifafudugawuxuj.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1734/6965/files/kukibitufebediter.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0674/6011/files/darth_plagueis_online.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/8184/3356/files/nopowubobekoz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2471/9773/files/arduino_micro_pinout.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6370/4729/files/tornillo_sin_fin_y_corona.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_off000051ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x51AE 5740 bytes
SHA-256: c78cb07b1055140d0496f4f9298b0b0e5824313a838d66b7bd811dd771fa7500
font_01_sfnt_off00006506.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6506 12980 bytes
SHA-256: 57968c7423875a701c0bf6c82239e1394a59502f111bbabe72219215876741b0