Malicious PDF — malware analysis report

Static analysis result for SHA-256 19dbab535b4e1171…

MALICIOUS

PDF

43.2 KB Created: 2020-07-27 17:21:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 6ba44c5603d158442d56333bc1f9101e SHA-1: 4f97cf1053521ce1a45a345788e1673c346df912 SHA-256: 19dbab535b4e11712393ed3ac0fd3557c96b7a95be75e2b5d0414f52de07a4d8
202 Risk Score

Malware Insights

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

The PDF file contains multiple heuristics indicating malicious intent, specifically linking to a known malicious redirector and acting as a link farm. The document body, though heavily obfuscated, suggests a lure related to an 'admission form'. The primary IOC is the redirector URL, which is likely the entry point to a malicious workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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=aiou+admission+form+2019+ba+continuing+student In PDF document text
    • http://files.assemblyofgeeks.com/uploads/1/3/1/6/131636651/6241108.pdfIn PDF document text
    • http://files.olssyouth.org/uploads/1/3/1/3/131384635/linisenetajeme.pdfIn PDF document text
    • http://files.thequakermag.com/uploads/1/3/1/6/131606186/1527062.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/1/0430/7812/3680/files/43704356281.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6295/1074/files/28788728346.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3685/1874/files/vezofubujuxo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/75555741983.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/5023/6064/files/maborobomaferuzi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/4384/0412/files/58179249088.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/8940/2779/files/60741829547.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/2820/0096/files/tukonoxaxivupemulako.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/8220/3801/files/8146465792.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/8660/0609/files/86285165076.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/wimuwukewamofese.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/77363931764.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/suton.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 2

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_off00006940.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6940 5804 bytes
SHA-256: b0b2b0b260093e6bfb50332b7337068ed282c32536bccffdc4040b53bb062cea
font_01_sfnt_off00007cda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7CDA 10168 bytes
SHA-256: 482b91590947cdd4c5a3d1f40e8f9dc3bc6e4844714f91d9c5d238e8fe39d767

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