Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8fa1c4b55b46d9d…

MALICIOUS

PDF

52.3 KB Created: 2020-08-14 18:42:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 5559f31cfb8fce9e4299ecd13eb20a60 SHA-1: 66959893d768fc7ad42fabeee13ab15518949026 SHA-256: b8fa1c4b55b46d9d70d430a188ea9dc9e159d27e3e4c9af26c932cf87939e795
194 Risk Score

Malware Insights

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

The PDF file contains multiple embedded URLs, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains text related to 'Capitulo 1b realidades 2 answers page 22', suggesting a lure. The presence of a malicious redirector indicates an attempt to lead the user to a harmful destination, likely for phishing or malware delivery. The file was generated using wkhtmltopdf, a tool sometimes abused for malicious PDF creation.

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=capitulo+1b+realidades+2+answers+page+22 In PDF document text
    • http://files.rp-360.com/uploads/1/3/1/3/131398479/722009.pdfIn PDF document text
    • http://files.partycentralmd.com/uploads/1/3/0/7/130775837/18a99c85ecf47.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/1/0431/1161/2572/files/igcse_acids_and_bases_notes.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/3506/5505/files/ace_personal_trainer_manual_4th_edition.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/66541571973.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/4836/0343/files/pneumatic_system_in_aircraft.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6761/3089/files/20453353912.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/4927/7845/files/11680221766.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9646/5823/files/kuxuguneka.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/8007/0808/files/excel_vlookup_function_tutorial.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/3189/4944/files/xewiramumuwifinigadiviket.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007121.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7121 5448 bytes
SHA-256: 401d7d235e066e40c56c59752cca636acae9141440c607c5758be6a6d7d3779e
font_01_sfnt_off000083c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x83C6 13456 bytes
SHA-256: c65e1fea3e89f4f54c0ad23299a857dca869df246d1b3decfb5c9e2dbc58e4dd
font_02_sfnt_off0000af1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF1A 16248 bytes
SHA-256: fbeccb1482ee56052ed809ec6cb7dfbc577d51b9212e43fffabc93e29761b6bf

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