Malicious PDF — malware analysis report

Static analysis result for SHA-256 57aa8fc86701a11f…

MALICIOUS

PDF

43.5 KB Created: 2020-08-19 08:29:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-07
MD5: 1d72ffcb9de839124f32e5c5d4b897c9 SHA-1: 8989df7ea6cbd034a616be9604bfc2d33c06e11f SHA-256: 57aa8fc86701a11f1a39aa4effb7d13b394984c1a6be1f40323956a7e7704a48
202 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, a common tactic for SEO poisoning and redirecting users to malicious sites. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.ru/pify?keyword=urkund+plagiarism+checker+free'. The document body also contains text and links related to plagiarism checking, suggesting a lure to trick users into clicking the malicious link. The presence of a 'download button' heuristic further supports this social engineering attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=urkund+plagiarism+checker+free In PDF document text
    • http://files.rebeccaattia.com/uploads/1/3/1/6/131607467/3587803.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/2581582401.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4034/2169/files/89419725437.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/4923/8179/files/leruzebawegaluvegimegava.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8362/0757/files/dumenabinilafedujosime.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8716/7649/files/burejivuzuvitukovu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6440/1818/files/26681164109.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/1473/1429/files/pijizebilaludi.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_off00006b9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B9E 5624 bytes
SHA-256: a60a75438ec8bd2e5829c73d09d20fe1621a16bc9efb78b87abad08e8d27f1f3
font_01_sfnt_off00007e8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7E8F 10400 bytes
SHA-256: 3af7de4a9e5510b1901cf00c814a32e68d588b36c241a3673bdc9ae121ae8936

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