Malicious PDF — malware analysis report

Static analysis result for SHA-256 664eef9c5ece6766…

MALICIOUS

PDF

32.9 KB Created: 2020-08-10 09:43:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 379629036d70626f36ffd87375467858 SHA-1: edc368691f4c911e214c6215494350d99b474f60 SHA-256: 664eef9c5ece6766616941f09d5f6550ff42f6b2e84e0520badac030a4f3ee4a
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links, many pointing to a redirector service, indicating a link farm or SEO manipulation tactic. The primary redirector URL is identified as malicious. The document body, though heavily obfuscated, contains a reference to the malicious URL, suggesting an attempt to lure users into clicking it for a supposed 'nitrogen and its compounds questions pdf'. The ML classifier also strongly indicated maliciousness.

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=nitrogen+and+its+compounds+questions+pdf In PDF document text
    • http://files.riverroadflowers.com/uploads/1/3/0/8/130874482/bibufak.pdfIn PDF document text
    • http://zezej.stereo-microscope-store.com/uploads/1/3/1/0/131070420/c048d78e759b4.pdfIn PDF document text
    • http://rulewigu.toledotowing.net/uploads/1/3/0/8/130813612/lujinudamotagu.pdfIn PDF document text
    • http://ruridusi.trevoultersouthdevons.com/uploads/1/3/1/4/131407469/c2a376.pdfIn PDF document text
    • http://files.madhuritherapeutics.com/uploads/1/3/1/4/131407299/fexipigisuxa.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/1/0431/7777/1162/files/kojoxuraluge.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/9735/6443/files/git_config_ssh.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/wemulaw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/38684703775.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/4478/8634/files/16867988370.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3108/4708/files/8868091877.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/73633131036.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/28664871254.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6578/6006/files/xetuluzidobofadomuwipano.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0391/2098/files/lusoxififarirema.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6424/5925/files/marveloptics._com_scholarship_essay_contest.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 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_off00004505.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4505 5540 bytes
SHA-256: 6eedfc6ff770d810fef69aba016e7de7e748f61dab852a72d65e7154c1cce3a9
font_01_sfnt_off000057c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x57C9 9048 bytes
SHA-256: 4577256fdc3d5c4f66edbd5303145c82f634acca5024d5a7dc58061816da8ca9

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