Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a1d2e8071ac3388…

MALICIOUS

PDF

42.4 KB Created: 2020-08-09 05:58:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-07
MD5: 03f333bf0595dee1c5bae2a8f2093d64 SHA-1: ef78b45338e3a9a059deff3b864b55689413bb65 SHA-256: 8a1d2e8071ac3388e107fded1e78c897e678aa1d18ef085672d699ebe03f4e8c
194 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one pointing to a known malicious redirector. The document body is heavily obfuscated and appears to be generated content, likely to mask the malicious intent of the embedded links. The primary goal seems to be SEO manipulation or redirecting users to malicious content via the link farm.

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=b+tree+insertion+and+deletion+pdf In PDF document text
    • http://files.fx-toprebates.com/uploads/1/3/0/8/130813796/dalozadose.pdfIn PDF document text
    • http://files.umcow.org/uploads/1/3/1/8/131856125/6998459.pdfIn PDF document text
    • http://vivezaji.rbef.tv/uploads/1/3/1/3/131398140/nekibu-xijapavujatot-gevuvix-wilefif.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/1/0430/1671/6437/files/71179216562.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/9563/7659/files/91146664332.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/6405/0332/files/pemupazunixupexogujisos.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1153/8072/files/alimentacion_complementaria_oms_2020.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5349/0071/files/zokawelu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/46905239833.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/9802/9733/files/51386976831.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/1028/3931/files/nivufigetazali.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9236/9823/files/fomod.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/9001/6424/files/ableton_live_9_user_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/4066/7810/files/3._5_character_sheet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/1019/5605/files/15102544560.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/3545/7696/files/94019416490.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 2

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_off00005f52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F52 5084 bytes
SHA-256: 2158f3761618a85f6df8a7a63b12d4e095d9f6ccb6d37d01c9a016df086f72f8
font_01_sfnt_off000070a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x70A9 13856 bytes
SHA-256: 2f3f1f611c42e5d8da8b311d933ace7ee0515b0cc177bc51b5e3b62e7549de97

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