Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd906ed850189ce7…

MALICIOUS

PDF

56.6 KB Created: 2020-07-30 06:40:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-07
MD5: 06dc6f6e137e98ba6bd808f5b4c05004 SHA-1: b25f433dd41186ee6e7ecd81fca5488863dbf9c0 SHA-256: cd906ed850189ce7553e311132df80443d780b36bac19415f3655d0d1a6bae0d
194 Risk Score

Malware Insights

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

The PDF was flagged as malicious due to a high number of embedded links, many of which lead to a redirector. The ML classifier also strongly indicated maliciousness. The document body contains garbled text and metadata indicating it was generated by wkhtmltopdf, suggesting it's not intended for human consumption but rather as a vehicle for the embedded links.

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/wb?keyword=kinh%20l%E1%BA%A1y%20cha%201%20pdf In PDF document text
    • http://files.metermixdispense.com/uploads/1/3/1/4/131438038/f8730f32cb63.pdfIn PDF document text
    • http://files.historicfoodways.org/uploads/1/3/2/7/132740584/2db35dc7c.pdfIn PDF document text
    • http://files.jeffcofiretraining.org/uploads/1/3/2/6/132681409/4110604.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/1/0431/4651/0504/files/xogowekepakizaxolasonubed.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7275/7668/files/vawupirerojepujivor.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9161/6153/files/warinovuvugozirolis.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nazowexoratusitufunu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9767/0303/files/nudotebojelolusuwazebaw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4506/8699/files/zivedasepimusapuje.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8068/7524/files/wuvukulejoxarebopojuwi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/6117/2631/files/jilelaropudu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1954/2434/files/42043117474.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/5346/6271/files/roniloropivome.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/2344/8736/files/besitezorak.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7986/8324/files/mutidabiginizizote.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5464/4894/files/dezadojize.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/4174/3263/files/fuvagaduwemazobi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/6405/7238/files/vamotewopem.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 8

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_off0000915c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x915C 4796 bytes
SHA-256: c0acd6654009c1343ee51718fe2aebe863a55d55a6c33841da6abfa14a7a6bf4
font_01_sfnt_off0000a106.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA106 23676 bytes
SHA-256: 4fc580e936ce63586829e532972f3df3551951397b1a8a0761dad59f949e1a5d

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