Malicious PDF — malware analysis report

Static analysis result for SHA-256 8739b2f4bc1e707e…

MALICIOUS

PDF

32.8 KB Created: 2020-08-16 20:50:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: cbf367790ed1721cb11dfe4ed0bf9ea9 SHA-1: 6612275236a2a5125ccf2b1f276d88aaaa16b38b SHA-256: 8739b2f4bc1e707e609a938360ce13b8e713b1602ed9fa8a4252282efda84f9e
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links that redirect to a malicious domain, identified as a redirector for SEO link farming. The document body, though heavily obfuscated, contains the URL that is also present in the heuristics, suggesting an attempt to lure users to a malicious site under the guise of providing a calculator manual. No scripts were extracted from this sample.

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.ru/pify?keyword=casio+fx+991es+plus+calculator+manual In PDF document text
    • http://files.tasteofmansfieldct.org/uploads/1/3/1/3/131378993/xalosapupexab-zikazijogoga-mazifipoxumis-polebafawefel.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/1/0434/0082/2934/files/21124849284.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/9391/5800/files/mumakujolize.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/7376/3496/files/associer_plusieurs_en_un_seul.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4903/3640/files/26600416857.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5499/7402/files/70787819788.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/3689/1544/files/92664602218.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/4684/6107/files/99794049455.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6013/3031/files/kti_pneumonia_pada_anak.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 3

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_off000042fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x42FD 5344 bytes
SHA-256: eb23be852df3417ad6df491c6d3858d7162a33577674ddd8d8b5b48f59aa568d
font_01_sfnt_off0000551a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x551A 9820 bytes
SHA-256: 3262dd176101e16c9d4772d2e888d18d32fd944c7d322d590b5dc596bfc3818f

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