Malicious PDF — malware analysis report

Static analysis result for SHA-256 a78af21b91ed1687…

MALICIOUS

PDF

46.2 KB Created: 2020-08-21 06:09:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 2bde05027ee5c165774c7743ebc9da41 SHA-1: 46d03d03a5344046ce0aac3f6b5a1c94e2f8ad32 SHA-256: a78af21b91ed1687acfe403ead87127c828cd04b483acd028f33ee2afd6d27ef
194 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one pointing to a known malicious redirector. The document body and embedded links suggest a lure to trick users into visiting potentially harmful sites. The presence of numerous PDF links, many hosted on Shopify, indicates a link farm strategy. 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.ru/pify?keyword=cool+answering+machine+messages+audio In PDF document text
    • http://files.echoltdqc.com/uploads/1/3/1/4/131409333/lijot.pdfIn PDF document text
    • http://xususej.ahubbardjewellery.com/uploads/1/3/1/4/131437914/eaaab024a.pdfIn PDF document text
    • http://files.eeutah.org/uploads/1/3/1/4/131437276/serovomexepa.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/1/0431/6217/3604/files/pathogenic_bacteria_in_food.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5910/9279/files/53288180616.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/2906/0001/files/fibutuzakejudin.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/5863/3627/files/nojexomazebed.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/5802/8959/files/tijejakanegex.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0562/3972/files/tiwamowibon.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/5594/6645/files/zuwerikunesoziz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/8201/4108/files/5794486377.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0161/8327/files/69472533054.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7428/8793/files/the_bourne_identity.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/2805/4169/files/50396235302.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007722.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7722 5348 bytes
SHA-256: 6f56b0aa7c5fc8d4a11c333934467693dcd1e0a8448af31da16e66899092991b
font_01_sfnt_off00008933.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8933 10156 bytes
SHA-256: ab9533cfeeed21837321b5f2aa2d9deed5a52249cdef47fdc753d7d1737e9fe8

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