Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc99bb1dc73f3b23…

MALICIOUS

PDF

39.2 KB Created: 2020-08-05 10:17:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 3abba268b7b20bfb7034596d2a9e95e2 SHA-1: 57a4713bf5df4a1176e0889c85a6ea8aed6c4086 SHA-256: bc99bb1dc73f3b23907f6df3a1dc7bc01a91fee7ca2fd3075b76986b543036d2
194 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to redirector infrastructure designed to lead users to malicious sites. The document body, though heavily obfuscated, contains a URL that matches the primary redirector found in the heuristics. This suggests a phishing or scam attempt using a lure related to 'Alkyne nomenclature'. No scripts were extracted, but the presence of multiple external links indicates a redirection-based attack. The ML classifier strongly supports the malicious verdict.

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=alkyne+nomenclature+pdf In PDF document text
    • http://files.embracingtheimpossible.com/uploads/1/3/1/4/131436981/nerurogob.pdfIn PDF document text
    • http://files.lovefoundationproject.com/uploads/1/3/1/4/131453990/eee17ce9a5458.pdfIn PDF document text
    • http://files.americanbuttercupclub.org/uploads/1/3/2/7/132740405/5337151.pdfIn PDF document text
    • http://files.northcascadeyouthfootballleague.com/uploads/1/3/1/8/131858540/nozisozegex.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/1/0428/2076/3804/files/dadewikegilefogonibagap.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1403/7397/files/fantasia_model_aiy.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6667/0745/files/idsa_neutropenic_fever_guidelines.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4105/4111/files/bcs_theory_notes.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/9641/6161/files/fusaligetunujokotowug.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6853/8521/files/battlestar_galactica_season_1_torrents.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/9785/8972/files/48701177921.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/7206/8520/files/tet_answer_key_2020_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/rijakilijupefiwopoxafeza.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/8049/9879/files/median_of_three_quicksort_java.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 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_off00005ba7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5BA7 5280 bytes
SHA-256: 42fb3a4e873e89622537c657fce569ae0837b41c2017b082324db7e90796b363
font_01_sfnt_off00006d93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D93 10280 bytes
SHA-256: 909486ab4afdb2a0c059c1c0cb9e195ead61ef1784169caf5b4191f4be50c7a7

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