Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca555b647bd4fa8b…

MALICIOUS

PDF

47.6 KB Created: 2020-08-05 01:39:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 31d2a6e790a0ca8db55a78018211a7d6 SHA-1: 76bf874cfd807f4d22ff666b32eb3a3093c8c695 SHA-256: ca555b647bd4fa8b7880dfc6b10bad434f6cc6944e3ed019d32085297f608043
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link that redirects to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body and embedded links suggest a lure to download academic papers, but the primary link leads to a redirector. 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=ap+polycet+2020+model+papers+pdf In PDF document text
    • http://files.theconsumerperspective.com/uploads/1/3/1/0/131070560/balawozoxajebepekib.pdfIn PDF document text
    • http://files.fbclocustgrovepreschool.com/uploads/1/3/0/9/130969503/lojub.pdfIn PDF document text
    • http://files.maxwelljc.be/uploads/1/3/0/8/130814118/dudoguxejebiwevu.pdfIn PDF document text
    • http://files.cepohio.com/uploads/1/3/2/3/132303238/8834995.pdfIn PDF document text
    • http://files.forwater.ca/uploads/1/3/1/1/131164236/1f6b7f3ee7ac.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/1/0431/8678/2369/files/96979715197.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4155/3575/files/55265951547.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/5680/6553/files/kejamaraxilex.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0447/4827/5863/files/autocad_mep_2020_user_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/1161/8462/files/principles_of_econometrics_5th_edition.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/3158/5180/files/caverna_cave_farmers_rules.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4908/2264/files/21730573988.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4346/3069/files/fuwimivagasivapenibozez.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/22700630349.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6656/4503/files/b_m_sharma_cengage.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/1097/3083/files/70107107366.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/4431/4011/files/texegogozefizu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4039/8750/files/newonap.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_off00007aa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7AA2 5668 bytes
SHA-256: 82a64657e6808180761004f4c0374d8b01b7f043e9b82a95849a4f0f3e9be9fe
font_01_sfnt_off00008de2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8DE2 10268 bytes
SHA-256: 0adee47367939513335d74abf0c8c89099b441474363e5123d3cc07c7984d734

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