Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1f101038d8d1f0f…

MALICIOUS

PDF

54.8 KB Created: 2020-08-22 23:39:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 4e39ecef4da82b817e280d9e1eed0abe SHA-1: 75d30e1dbf5404690152757363f624632f023103 SHA-256: a1f101038d8d1f0f502b70ed9f99bcc7b625e5174e5f05eb2b46d57a50799b7d
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, many of which point to external PDF files, indicating a link farm. One critical heuristic identified a link to a known malicious redirector, ttraff.cc, which is used to obscure the final destination. The document body, though heavily obfuscated, contains the same malicious URL and benign-looking URLs, likely to appear legitimate. The primary attack vector is a social engineering lure to trick users into clicking the malicious link.

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=hospital+management+system+admin+template+free In PDF document text
    • http://xaniri.summerjhb.com/uploads/1/3/1/6/131606165/744f5c8b33aca6f.pdfIn PDF document text
    • http://figifiset.discoveringscienceisfun.com/uploads/1/3/1/4/131483281/6552938.pdfIn PDF document text
    • http://files.katherinegaulke.com/uploads/1/3/1/4/131437418/3611806.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/1/0435/3628/5860/files/apprendre_le_portugais_gratuitement.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/43778875991.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0460/4094/0708/files/bangla_cid_video_3gp.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/7597/5830/files/21849923415.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0466/2856/9253/files/53827979947.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/4219/4083/files/71586285155.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/2783/1712/files/birthday_invitation_template_maker.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/7519/7346/files/76473103908.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/3078/8758/files/jotulozusebawir.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/3863/0300/files/vonujefixed.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 3

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_off0000987b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x987B 5424 bytes
SHA-256: 238a3336fce6b4ccf46eaec5980a339967508590232e0eef3575b548921143a3
font_01_sfnt_off0000aad9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAAD9 10248 bytes
SHA-256: 58e6fa9f57c0c06b4f362939bfd48b68fe1300dc71e9c5ff5d5133eaa64f9151

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