Malicious PDF — malware analysis report

Static analysis result for SHA-256 55fab71a94af0924…

MALICIOUS

PDF

41.0 KB Created: 2020-08-06 05:44:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 22dcd974a2677d005e095a824a9681a4 SHA-1: 1a6d03755c8e0787ef834a51a771f1ec4b34cdbc SHA-256: 55fab71a94af09243ca2d93626d9bed560dfeaac8a2f7d61ce3ac2d6ac0f7cd9
194 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying a link to a known malicious redirector. The document body, though obfuscated, contains text related to 'Apache server tutorial pdf' and includes the malicious URL, suggesting a lure to a malicious site. The ML classifier also strongly flagged this PDF as malicious.

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=apache+server+tutorial+pdf In PDF document text
    • http://files.midlifejoyride.org/uploads/1/3/1/4/131407102/38dc43815e7e954.pdfIn PDF document text
    • http://files.stabletransformation.com/uploads/1/3/0/7/130739457/686e6be577b9ea.pdfIn PDF document text
    • http://files.toscakilloran.com/uploads/1/3/2/6/132695732/1775294.pdfIn PDF document text
    • http://xitetiz.aliciazeigler.info/uploads/1/3/2/6/132683014/fdc577ff40.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/1/0432/2266/3325/files/rubebototazud.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7757/4557/files/bedizimabagabikixosumisez.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/1510/8765/files/figejobaxuvedubajuxika.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zutowujovepenatugipo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/6021/3398/files/sudepivosebevawizuruj.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/6902/1089/files/27522534702.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/9477/8791/files/36072263052.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7494/5184/files/65225901982.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2746/3324/files/tatuvavuzex.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2649/7182/files/82174193177.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/9998/7873/files/61344634846.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8443/9971/files/63627114492.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
🗂 Part of campaign: stchrislocker.com 5 samples

Related samples 4

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_off00006303.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6303 5292 bytes
SHA-256: ca42c208b029ed59557f8dfa93c56fa01015d6c80e297818cc02066d09dac620
font_01_sfnt_off00007502.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7502 10012 bytes
SHA-256: 6babb46866fbe02a14652d5619befbbe6fe4a2454e8c7b807fb33aba8ba95ac5

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