Malicious PDF — malware analysis report

Static analysis result for SHA-256 751a69d18c26f851…

MALICIOUS

PDF

35.1 KB Created: 2020-08-14 17:35:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-07
MD5: 105daa9e6f796bc577b934cfcfad6a14 SHA-1: 4c0c66cf38d7e50ca388c33711c699c4706f6705 SHA-256: 751a69d18c26f85150ac0db081bd10994aba33e5772696d166725da0b04e004d
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded links and a visible URL in the document body, all pointing towards redirector infrastructure. The heuristic firings indicate that these links are part of a malicious redirector and a link farm designed to phish users under the guise of free downloads. The ML classifier strongly supports the malicious nature of this PDF.

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.cc/pify?keyword=bhoot+fm+7+december+2018 In PDF document text
    • http://files.100alicestories.com.au/uploads/1/3/1/4/131437457/riludunifema.pdfIn PDF document text
    • http://bakal.sturdystudy.org/uploads/1/3/0/7/130738730/rezonupujox-kitarudalaxa.pdfIn PDF document text
    • http://komifawa.dinarguru.com/uploads/1/3/1/1/131163601/8320053.pdfIn PDF document text
    • http://files.downstageimages.com/uploads/1/3/0/7/130738799/fe344ab7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/5561128363.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/8225/8334/files/al_itqan_fi_ulumil_quran.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5282/5750/files/aerodynamics_textbook.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/7729/4485/files/45982800060.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/1042/4985/files/73434402803.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/8733/0464/files/30952478396.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9454/0439/files/fotukidirawelenipobu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/3309/1480/files/doposowolutifedufoxekefog.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1393/9110/files/nifeziwubok.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003fb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3FB3 5264 bytes
SHA-256: b9c242d01c12c07520a70cd643d6257174a37f7f4e8a18af031ef1257b189490
font_01_sfnt_off000051a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x51A9 9400 bytes
SHA-256: 5fe7ef6082d796fa595750ffd182bfd5f00c85ea322dd34c5cba6c42e38b461c
font_02_sfnt_off000071c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x71C9 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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