Malicious PDF — malware analysis report

Static analysis result for SHA-256 81ca824e55d24cbe…

MALICIOUS

PDF

55.5 KB Created: 2020-08-22 10:49:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: e92932ac2adf97231ab6083ab91c0a24 SHA-1: cc4385c13837d1ea9a618b35fa6fb86f94791417 SHA-256: 81ca824e55d24cbef6b6d8330dae038f647f9d98fbe587b900d6988e7492294b
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 a redirector service designed to obscure the final destination. This is indicative of a link farm or phishing lure, aiming to trick users into downloading further malicious content. The ML classifier strongly supports the malicious nature of this PDF.

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.com/pify?keyword=physical+properties+of+activated+carbon+pdf In PDF document text
    • http://kubimire.shonscience.com/uploads/1/3/1/4/131453526/judinitorolojun-zesusekuzivavuj.pdfIn PDF document text
    • http://files.correctyourconcrete.com/uploads/1/3/1/3/131379362/xijokerora_jitusaxasusole.pdfIn PDF document text
    • http://fozabiz.pairtradingpro.com/uploads/1/3/1/6/131637030/6fa001.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4745/1798/files/mito_di_amore_e_psiche.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/4979/4213/files/marine_biogeochemistry.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7176/6677/files/45044870165.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/5249/9098/files/9903525784.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6031/3768/files/45729720203.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/2717/6344/files/9396501210.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/3748/2405/files/xuveguw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/9439/2485/files/wordly_wise_3000_book_5_fourth_edition_answer_key.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4257/0402/files/blackberry_keyone_android_8_oreo.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008cc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8CC7 5336 bytes
SHA-256: b108262c809984001e468b190edff941d3b8bede68c648a8cf38e8db493934da
font_01_sfnt_off00009eda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9EDA 10584 bytes
SHA-256: ea740783aa9641abd323248a685899d5ec74524cd7fb93b60301a59bd0cdbde6
font_02_sfnt_off0000c2f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2F9 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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