Malicious PDF — malware analysis report

Static analysis result for SHA-256 51d28ddf6b0d0692…

MALICIOUS

PDF

58.7 KB Created: 2020-08-04 18:14:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 6bc276078d9f49284b0c73023892c1c6 SHA-1: 36b2eca3b55d4902bafdc272d6be6d30e44eca6f SHA-256: 51d28ddf6b0d0692ec4c4124613692585f0e85bcc95deee8375d12c557333438
194 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, a technique often used to distribute malicious content or phish for credentials. One of the embedded URLs, 'https://ttraff.cc/pify?keyword=antibody+structure+instability+and+formulation+pdf', is identified as a known malicious redirector. The document body, though heavily obfuscated, also contains this URL, reinforcing its malicious intent. The presence of numerous links, including the malicious redirector, suggests a link farm or a phishing lure.

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=antibody+structure+instability+and+formulation+pdf In PDF document text
    • http://files.karilagandancesociety.org/uploads/1/3/0/7/130776809/7153808.pdfIn PDF document text
    • http://files.minerelementary.org/uploads/1/3/1/6/131637658/9966579.pdfIn PDF document text
    • http://files.kannwoodtimberworks.com/uploads/1/3/2/6/132682833/tejib.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/1/0432/3688/4642/files/28105279273.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9436/8663/files/vepepozavevupe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8450/5498/files/juvukoletadiwak.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0441/1057/7816/files/fujifabotazo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/1560/2337/files/44588401334.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2449/8333/files/gowefiditirenewipubo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/6663/9014/files/5217693057.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7245/3797/files/judixukevofigux.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/7594/5113/files/80288688843.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/2416/1695/files/67759557170.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/1140/0102/files/28163949750.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/9367/1590/files/desaziridobudof.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1829/7245/files/16604417757.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/5901/9933/files/xovigirojetupar.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/8360/4903/files/dibufix.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_off0000a4d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA4D0 5532 bytes
SHA-256: 40de8f4bdcbbbf71fe7c64889a9c5676438ca866538014ebe9194f6d47c0b902
font_01_sfnt_off0000b793.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB793 10964 bytes
SHA-256: 49c8740f1afce6fdcd042abbe0042e0770b17462d0648f73cedaf58b6240bcf4

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