Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3d4fb2a71d4d074…

MALICIOUS

PDF

58.2 KB Created: 2020-08-07 22:08:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-07
MD5: 167fcb8581a3decf3a740ff9ccd36ac5 SHA-1: e7588d330ab740f833e9357499ccc29301cb0970 SHA-256: d3d4fb2a71d4d074aa2743a24f4809004fad41224ac3cc81b823030005c2717a
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 firing indicating it links to known malicious redirector infrastructure. The document body and embedded links suggest a lure related to TOEFL test preparation, aiming to trick users into visiting the malicious URL. The ML classifier strongly supports the malicious nature of this PDF.

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.ru/pify?keyword=toefl+test+preparation+guide+pdf In PDF document text
    • http://files.arkansasquesters.com/uploads/1/3/2/8/132815004/2898574.pdfIn PDF document text
    • http://files.littlepieceofmyheart.com/uploads/1/3/0/7/130740517/aaef0f352ce451e.pdfIn PDF document text
    • http://files.mx.catalinapacificunderground.com/uploads/1/3/1/4/131406337/wipuwazofope.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/1/0439/0925/1240/files/passione_canzone_napoletana_spartito.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/2729/1544/files/38299496568.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/0008/5160/files/62376389622.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/9950/3257/files/takoxawegovelotuzijugaz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7482/2043/files/petulaponewepolu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8012/2532/files/tixusug.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5131/0488/files/reset_amazon_echo_dot.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0776/9750/files/kujaxeweledis.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/3080/6679/files/60722404544.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0681/9477/files/dudofajidafewobo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2652/9956/files/xupodepiriw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8806/0320/files/jotafagojalibuxotizo.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 6

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_off0000a4b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA4B0 5160 bytes
SHA-256: e071d868a28443d477d93e269572ab5f7f48d83de65d59e3a5eff773c07cbed8
font_01_sfnt_off0000b64c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB64C 11036 bytes
SHA-256: fef96eb74b969e349a15c112afe87e5e0829bec6dbab0e94e129a65d665837ec

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