Malicious PDF — malware analysis report

Static analysis result for SHA-256 8559490dfee4be66…

MALICIOUS

PDF

34.1 KB Created: 2020-08-11 15:49:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 50a9e5cdd4210188c74a4b110afe1dcb SHA-1: 1032a5287090ebfd61e17b5880a87f7c112c6deb SHA-256: 8559490dfee4be662308fa740c5193bcec3dc8d2d7cfa5db1f9404c8a2e5d538
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with a critical heuristic identifying a link to known malicious redirector infrastructure. The document body, though obfuscated, contains the URL 'https://ttraff.cc/pify?keyword=caribou+menu+pdf', which is also flagged as a malicious redirector. The presence of a large number of external PDF links suggests an attempt to manipulate search engine results or distribute 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.cc/pify?keyword=caribou+menu+pdf In PDF document text
    • http://files.sergeypolstyanoy.com/uploads/1/3/0/8/130813364/8952842.pdfIn PDF document text
    • http://files.stonetreematerials.com/uploads/1/3/1/1/131163957/35aaee013.pdfIn PDF document text
    • http://files.hombomtoys.net/uploads/1/3/1/3/131383949/joxixurifuweval_tofofenidofe_refoda_fakew.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/1/0432/4442/1282/files/vikapubitarasedi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9459/8047/files/conjunctions_in_english_exercises.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0127/3758/files/47426829006.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4365/1741/files/62591230430.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7921/2959/files/delonghi_espresso_ec_155.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5777/3725/files/86831291157.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/22411539251.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2256/5032/files/70255686383.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/0651/5611/files/nudodif.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/73768917897.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/1313/4757/files/sunorurimuzegeditutufez.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/6249/1286/files/16520074357.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_off000047a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x47A8 5024 bytes
SHA-256: 66b4efdf30f3ad0bf1e079542e1858f81eea6cebc3b85ba0ad5d89f878dd0147
font_01_sfnt_off0000589b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x589B 9960 bytes
SHA-256: d93d534e9cca52b234f12b7c113befa5399502a6a38925062e4d032636a478a0

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