Malicious PDF — malware analysis report

Static analysis result for SHA-256 51f9bf659b1d8d3f…

MALICIOUS

PDF

48.8 KB Created: 2020-08-28 02:27:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 3935c046d237693ed397a97f74867c32 SHA-1: 9a48111db8e4e658bf68416ae1ef1d9fca7d1339 SHA-256: 51f9bf659b1d8d3f3a4e6a9dfbf8452348dc50b01498ce881104081f4b275524
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link to a known malicious redirector, ttraff.ru, which is likely intended to lead the user to a malicious site. The document body contains garbled text but also includes the URL and a keyword suggesting a lure for software licenses. The presence of numerous other PDF links, many hosted on Shopify, indicates a link farm designed to obscure the malicious destination. The ML classifier strongly flagged this PDF as malicious.

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=hyperchem+lisans+kodu In PDF document text
    • http://files.body-knowledge.com/uploads/1/3/1/4/131454272/4089604.pdfIn PDF document text
    • http://files.pearlywhitespediatricdentistry.com/uploads/1/3/1/3/131378993/fukegan.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/1/0433/0687/7080/files/52299098946.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0447/5843/3943/files/machine_learning_a_bayesian_and_optimization_perspective_net_developers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1335/7214/files/surixogugabibigozirifom.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5928/1061/files/nipamimuzokirobifi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/5179/5107/files/61143615791.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6579/4965/files/56108758821.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/5108/0085/files/30074878876.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/8209/4494/files/besharam_song_ringtone.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/5145/6411/files/apple_kopfhrer_adapter_fr_android.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4192/2982/files/lopupapoguf.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9191/1066/files/72462107217.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/9212/3560/files/dipudunatasowibev.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0595/9574/files/49086848072.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7940/1632/files/93190555789.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 5

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_off00006fb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6FB8 5440 bytes
SHA-256: f1121d6a4fd24db755565b290d3795ef5f421714e5c2dea6ba2e589f36db8c27
font_01_sfnt_off0000820a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x820A 17484 bytes
SHA-256: b23b60d85ec380c4014b7ecb7f241d18beb4f1092934768598efd066ffc6e4f9

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