Malicious PDF — malware analysis report

Static analysis result for SHA-256 cba6f1147b67940d…

MALICIOUS

PDF

43.0 KB Created: 2020-08-08 15:31:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: a11bf06c5750e5315c8640dcc9b5b0d0 SHA-1: 396b384c2a22898246a0ce1e9370d548c699e18a SHA-256: cba6f1147b67940ddc2d1c7eed0b7fc6e51de047753ffdb98c493c17cc312848
194 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with the primary link directing to a known malicious redirector. The document body, though partially corrupted, includes the text 'Acknowledgement letter example pdf' and the malicious URL, suggesting a social engineering lure. The heuristic firings confirm the presence of malicious redirector links and a link farm, indicating a phishing or malware distribution attempt. No scripts were extracted from this sample.

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.com/pify?keyword=acknowledgement+letter+example+pdf In PDF document text
    • http://files.craigleacapetown.com/uploads/1/3/1/8/131871569/4a8692675f1c.pdfIn PDF document text
    • http://files.zimengmusic.com/uploads/1/3/0/7/130775998/xemaleva.pdfIn PDF document text
    • http://tuwepirot.divotees.co.uk/uploads/1/3/1/3/131380729/pedotefef_wuweti.pdfIn PDF document text
    • http://files.connectingcasualstops.com/uploads/1/3/1/8/131856602/tikovivalenebupavu.pdfIn PDF document text
    • http://files.cottageglen.net/uploads/1/3/1/0/131070294/rebaxabexewasogiz.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/1/0431/9005/9157/files/6389295860.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/0027/2792/files/ca_dmv_reg_262.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1855/0430/files/73616253848.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/6164/7262/files/68986032742.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/0163/3177/files/amelia_bedelia_for_mayor.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/3816/3623/files/11211550194.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7144/6939/files/zinijubefewiwudov.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3559/8758/files/31492217413.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/78046530146.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2065/6545/files/76324678247.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5733/9816/files/pdf_to_word_editable_converter_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7258/5881/files/mavisomus.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6219/0499/files/3556093534.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_off00006aa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6AA2 5512 bytes
SHA-256: 45d9fe3998bcb9be292c98de99f3b4dfae55af3c32fd24d89c126c76c2a15d69
font_01_sfnt_off00007d6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7D6B 9884 bytes
SHA-256: a3d6bcb8d1587b505cde9bcf41874b55ee01e47996090a7f6d0326cc463c6006

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