Malicious PDF — malware analysis report

Static analysis result for SHA-256 15d113e2733e96dc…

MALICIOUS

PDF

40.8 KB Created: 2020-08-05 02:55:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: f3e513c2f2f45a90c2e9ffb3cdfa44ea SHA-1: 15a78f4b091a255bcc0b41932684c5753f1b84b1 SHA-256: 15d113e2733e96dcea0bc2774ab32f5827da62f392353a05e16fb039cdb24098
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links, many pointing to a redirector service (ttraff.cc) which is flagged as malicious. The heuristic PDF_SEO_LINK_FARM indicates a large number of external PDF links, suggesting a link farm designed to attract clicks. The ML classifier also strongly indicates maliciousness. While no scripts were explicitly extracted, the embedded URLs and link farm structure are indicative of a phishing or malware distribution lure, likely delivered via spearphishing.

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/wb?keyword=fluent%20english%20course%20pdf In PDF document text
    • http://files.sheldonxink.com/uploads/1/3/1/4/131453302/gosozekexa.pdfIn PDF document text
    • http://files.lone-viking.com/uploads/1/3/0/7/130776257/juwifiwojugi-fuzavirof-zinaku.pdfIn PDF document text
    • http://files.amitytradedays.com/uploads/1/3/2/7/132712129/gesedo-wewoga-domawuno-tezesemowepila.pdfIn PDF document text
    • http://files.michellentherapy.com/uploads/1/3/1/4/131407901/6743438.pdfIn PDF document text
    • http://files.adamgormley.com.au/uploads/1/3/1/3/131398019/e5397a3.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/1/0430/3749/1354/files/83804505141.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/0749/0717/files/zozobojesove.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/2652/0986/files/46570081782.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7513/2824/files/53653289727.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/1877/2903/files/90788201647.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/5241/7703/files/19729675425.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/5913/2056/files/13462746327.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/3761/3461/files/vetajifigesafafevit.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/6440/7702/files/zumomegoxudizazu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/3591/7479/files/capital_humano_concepto.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/5163/9196/files/wefawewupewugidaromem.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/4012/6614/files/76835262394.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_off000062ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62EA 5160 bytes
SHA-256: fb5b44505b3dd03c2f5836ee73f7f3c2f3f79a7331d1654fd78d97cc826587ea
font_01_sfnt_off00007481.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7481 9972 bytes
SHA-256: 6bc2dbef254e11c38508ef03a6bd1e194c40d9ed7bd09ca3a2b488ffedc250a9

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