Malicious PDF — malware analysis report

Static analysis result for SHA-256 553549a7563d87f1…

MALICIOUS

PDF

44.4 KB Created: 2020-08-21 22:19:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: d26c5281cc9ab0ccf08fe7e2ac6e9190 SHA-1: 7844853bbda6e9ab471dbf368174686ca65e57af SHA-256: 553549a7563d87f1910e61a4266ab1033e12ca947c9526ea4b0869b4a8593956
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to a redirector service, suggesting a link farm or phishing campaign. The primary redirector URL is identified as malicious. The document body, though heavily obfuscated, contains the same malicious redirector URL and benign-looking PDF filenames, likely intended to deceive users into clicking. No scripts were extracted, but the presence of a malicious redirector and link farm heuristics indicates a high likelihood of a phishing or scam attempt.

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=alzheimer+disease+international+world+alzheimer+report+2015 In PDF document text
    • http://kovexa.mamayeva.org/uploads/1/3/0/8/130874113/patex.pdfIn PDF document text
    • http://tutadewof.lilyteng.com/uploads/1/3/2/8/132816066/dijib_pusupodevos_nenesute_fazed.pdfIn PDF document text
    • http://files.bathcitysociety.org/uploads/1/3/2/6/132682848/diwajixukamex.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/1/0434/6006/7480/files/94135242627.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7664/9124/files/41159057152.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/0553/4620/files/gurubaxipug.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0449/3488/9627/files/bridge_over_troubled_water_piano_solo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7259/3825/files/quicken_loans_arena_seating.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7465/0261/files/pakugipadujunabazufim.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8792/9245/files/difukidatar.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/5848/7703/files/9577171562.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0521/3852/files/76579362527.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/2155/6117/files/sexoba.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/0313/1542/files/widaku.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8684/7905/files/bixozunopegene.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2619/4333/files/tesadose.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/9619/3686/files/57255530875.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7723/7913/files/61250719244.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 1

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_off00006d84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D84 5780 bytes
SHA-256: f9b755a67d5c20db1d7e60b700a309a8c9dfba59f7e52605d7ca9708a6cc9a84
font_01_sfnt_off0000812a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x812A 10264 bytes
SHA-256: 3c680d4ab77d3ea8d8b80753760bda0aca43adf3b5ed0e0965494404b22f5256

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