Malicious PDF — malware analysis report

Static analysis result for SHA-256 157be8d2c2b2549e…

MALICIOUS

PDF

46.7 KB Created: 2020-08-20 03:33:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: ab53ff4dddd894ee48139bca3aa338c4 SHA-1: 852fcbaf0bc877b9836b5eff49639a5e1f109ad8 SHA-256: 157be8d2c2b2549e952b8279408a31e1b246bde7e68e74ccfde78ee4668c58ce
194 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to an SEO redirector at 'ttraff.ru'. This infrastructure is associated with distributing malicious content, likely through phishing lures or fake download pages. The ML classifier strongly indicated maliciousness, and the presence of multiple redirector links supports an attack pattern aimed at user deception.

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=bridle+verb+form In PDF document text
    • http://novizuw.delanomassey.com/uploads/1/3/1/0/131070604/bb48e43a33b.pdfIn PDF document text
    • http://files.thebellhouse.info/uploads/1/3/1/1/131164488/pobodukego.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/1/0432/1722/3840/files/20105305661.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/6987/5111/files/7281595437.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/4302/7106/files/55192284899.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/8072/1311/files/pekoxemonim.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6426/2818/files/53640745926.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/8103/1064/files/putepipavanetikelanelat.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/1520/9123/files/rukejenewaz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/0070/9791/files/53375625470.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/8670/7876/files/auto_service_manuals.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/8118/8003/files/ripolekaxoge.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/6448/2202/files/situfoboli.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000062ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62ED 4912 bytes
SHA-256: fc53e3803147d8b72fd1520733ba9d5d2b2c0b945446fa73eeb2630f92ef80f1
font_01_sfnt_off00007395.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7395 11028 bytes
SHA-256: ddf4961f41c7a3c80109bce99b274037672dfdecb895db3c077ed32a3c2242b3
font_02_sfnt_off0000991e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x991E 16060 bytes
SHA-256: 660d05b38fea380e8cc13f4a5a7db764e9bd2a20a73145a73af50c118749f22b

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