Malicious PDF — malware analysis report

Static analysis result for SHA-256 23c637e6cae555d4…

MALICIOUS

PDF

38.3 KB Created: 2020-07-31 12:41:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 733bb46e5274d0211e7f16f6ca9f31ba SHA-1: 9f4c210572b576ac7929d7a96e0e74e3bfc96212 SHA-256: 23c637e6cae555d46dfd91ee83083872e69e469970e151fd8949cbc9d9af2bbe
194 Risk Score

Malware Insights

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

The PDF file contains multiple embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, appears to be related to 'Cracking the sat physics subject test 16th edition pdf', suggesting a lure. The primary IOC is the malicious redirector URL, which is likely used to funnel victims to further malicious 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=cracking+the+sat+physics+subject+test+16th+edition+pdf In PDF document text
    • http://files.lifepsych.com/uploads/1/3/1/3/131398221/namukuvutozu.pdfIn PDF document text
    • http://files.sbmcwilliams.com/uploads/1/3/1/4/131406412/16a279be.pdfIn PDF document text
    • http://files.pe4d.com/uploads/1/3/1/8/131871745/3351726.pdfIn PDF document text
    • http://files.pvd.tech/uploads/1/3/1/4/131407102/954549bac777.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/1/0429/1624/9767/files/68336753267.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8982/1847/files/disowuwavilanivow.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/5465/1799/files/61062819395.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4251/2802/files/76782461708.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/4894/4295/files/podajaxigukadomix.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7802/5377/files/nixuke.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/5254/5701/files/31954290897.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5706/9721/files/mofaware.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0768/0405/files/bukogoxewokupi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/3915/2536/files/zulezeregijurugigosufat.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6741/6488/files/71721988180.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/8273/5006/files/fowikebepexazetedelunala.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_off00005660.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5660 5880 bytes
SHA-256: 980aa1f007b089ba320230c042d49d17be907bc736d6d70fec6c09fa3a658e53
font_01_sfnt_off00006a62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6A62 9696 bytes
SHA-256: 06147ac849cbe51dbdc9bbe1fb4e3a573859a4a5125a9dfeaab25fce68c5af05

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