Malicious PDF — malware analysis report

Static analysis result for SHA-256 bca134cc3f950c11…

MALICIOUS

PDF

43.7 KB Created: 2020-08-15 00:19:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 959b7e5a121a820def0f85039b327904 SHA-1: 256dfe9ca26bbb7efe7780d3186d2ae3e51108ff SHA-256: bca134cc3f950c11e6ac8d719e66783aa6cfe2e131cd50a4ed5c00a26ad8f3a6
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, with a critical heuristic firing indicating a link farm. One of the primary links directs to a known malicious redirector. The document body, though heavily obfuscated, contains the same suspicious URL, suggesting an attempt to lure users to malicious content through a deceptive document.

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=acca+sbr+examiner+report+december+2018 In PDF document text
    • http://files.lislhdbooks.com/uploads/1/3/0/7/130776245/tutatevifijatevija.pdfIn PDF document text
    • http://files.aquinasmaths.com/uploads/1/3/1/6/131637658/2235093.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/1/0437/9148/3041/files/muxasejefapibaviguwa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0639/3496/files/tumokijejuxudonanobifij.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0445/4694/9279/files/perfect_modal_verbs_explanation.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2358/0839/files/24384049400.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7248/6564/files/67722552038.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4774/6710/files/gedobokerirumitano.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/5358/0437/files/adobe_reader_gratis_bagas31.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/8921/3093/files/38757736990.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/23083433767.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/6874/2040/files/28488806921.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/5353/9747/files/vulvovaginitis_por_candida_albicans.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/8297/2326/files/fufubarapavirele.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/8068/6491/files/xelabilezelunesijupomojoj.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
🗂 Part of campaign: aquinasmaths.com 3 samples

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_off00006b7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B7D 5904 bytes
SHA-256: 2b2e885c0ebb3534046a0c8b6b86de1d6c449ac39f5b7a8a897ac3e110ce47a0
font_01_sfnt_off00007f7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7F7A 10168 bytes
SHA-256: a96f8f14ababde7601485a954bf6cf9c8f6351d14fe4f1c29d2892d825dd11b4

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