Malicious PDF — malware analysis report

Static analysis result for SHA-256 c99da832cc5131f1…

MALICIOUS

PDF

61.5 KB Created: 2020-08-04 06:51:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 962e60b39d053706922f37d04f21bb13 SHA-1: 6ced6bf2059064d91660e946aa773aeedff7f439 SHA-256: c99da832cc5131f1726f1d1633f1481a203555fc48c72794756511a8132c478b
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 Malicious Link T1059.001 PowerShell

The PDF contains a link that redirects to a known malicious domain, disguised as a search result for a calculus textbook solution manual. The PDF also contains a large number of external links, suggesting it is part of a link farm designed to manipulate search engine results. The embedded URL is the primary indicator of malicious intent, leading to a redirector.

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=calculus+early+transcendentals+8th+edition+pdf+solution+manual In PDF document text
    • http://files.kv-cleaningservices-uk.org/uploads/1/3/1/8/131856380/kamadedapetugorodo.pdfIn PDF document text
    • http://files.gorhamperformance.com/uploads/1/3/2/8/132815767/6704503.pdfIn PDF document text
    • http://files.boltonwilliams.com/uploads/1/3/1/3/131380005/gutadisirojuwo-wifamukuba-givigureburul-juxaw.pdfIn PDF document text
    • http://files.edgeofthewilderness.org/uploads/1/3/2/6/132695401/3891638.pdfIn PDF document text
    • http://files.chiaravisuals.com/uploads/1/3/0/9/130969489/9372049.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/1/0430/3182/2485/files/8485970663.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2114/8061/files/zepefudisifovopefejuze.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0306/8068/files/virurizejafukiwigo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7969/5526/files/jisoxut.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3081/4626/files/wolujimojijagotu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/5473/4241/files/google_finance_intraday_data.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6785/9359/files/fexowijenare.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/8562/5499/files/the_righteous_mind_free_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0965/4436/files/ubuntu_remote_desktop.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4047/2229/files/sevosixerarumisiwo.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_off0000a44b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA44B 5596 bytes
SHA-256: 54a1ab9190bef57f6bb9b69c5a9138b950d630dd25435ca8ce4982cebda19f94
font_01_sfnt_off0000b728.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB728 15704 bytes
SHA-256: e7e58c8b0812ac2c63322336fe59815cd5e9745521673c0cfcf320ee6e05ec05

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