Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ad6f8e61d443161…

MALICIOUS

PDF

31.5 KB Created: 2020-08-20 14:06:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: cf1313ec67e9388cd98ddb080713189b SHA-1: f7edc1e24630988fca4545ae9b256e20e95c24b0 SHA-256: 5ad6f8e61d4431615db7724dc81db3d7fe58f341070cd0b816d0d09b5520652b
194 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to a redirector service (ttraff.ru) known for malicious activity. The document body, though heavily obfuscated, contains text fragments and URLs suggesting a lure related to 'birdland weather report chords' and a large number of PDF links, indicating a link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to redirect users to potentially harmful 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.ru/pify?keyword=birdland+weather+report+chords In PDF document text
    • http://files.belab-eurachem2016.com/uploads/1/3/2/6/132696015/jipekemuzenev_zakikuzosusup.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/1/0437/7162/5634/files/vinizude.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/9971/6770/files/xukoseze.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7102/0957/files/selebesikaja.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/1729/8329/files/ffxiv_buying_a_house.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1304/5398/files/rockface_tv_series.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/1870/6341/files/19352638258.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/21511039237.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/8333/2772/files/exercise_physiology_lab_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vunumegosuvuvorewufo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7160/2849/files/20676299079.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 1

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_off00003ea4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3EA4 5300 bytes
SHA-256: 2b2f0d87a1e0f1530f2353bc0a67355bf77afd46379ca40ccd3b9374b6a6fa54
font_01_sfnt_off000050ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x50AD 9568 bytes
SHA-256: af61663eb0900dc97abbde15264575417abf954d90cb38fb5ca103771e5232a6

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