Malicious PDF — malware analysis report

Static analysis result for SHA-256 99c9cb982a3051cd…

MALICIOUS

PDF

50.6 KB Created: 2020-08-11 18:43:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: ea1b7977dfb768a030d792ffcb595f12 SHA-1: 34b84f6e9669a7d3f640f35c0a5c82c5e4862f7d SHA-256: 99c9cb982a3051cd8fe5de1e943a6ef251041e3776e2c7da4091bc7370f425ad
194 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one critical heuristic identifying a link to a known malicious redirector. The document body, though partially corrupted, contains text related to 'Class 10 maths book pdf ncert' and a URL that appears to be part of a SEO link farm strategy. The primary malicious link is https://ttraff.cc/pify?keyword=class+10+maths+book+pdf+ncert, which likely serves as a lure to a malicious site. The ML classifier also strongly flagged this PDF as malicious.

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=class+10+maths+book+pdf+ncert In PDF document text
    • http://files.mcshuki.com/uploads/1/3/2/8/132814155/c85ad26f5ca1a.pdfIn PDF document text
    • http://files.chimachancreations.com/uploads/1/3/1/8/131871569/lonaxixedokoxam_dadopituzaguli.pdfIn PDF document text
    • http://files.richardellishair.co.uk/uploads/1/3/2/6/132682737/jaxopaxaduso.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9580/9431/files/eu4_instant_build.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9587/5989/files/gupazuvaxuvujalelujopis.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2009/9488/files/12854117197.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/2062/2756/files/agriculture_in_ancient_egypt.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9787/4851/files/include_unistd._h.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/7404/4579/files/59139648490.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/0711/5423/files/87801487461.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/5575/2103/files/videozal._net.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/3818/6394/files/aria_bachianas_brasileiras_no_5.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_off00007999.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7999 5696 bytes
SHA-256: 23b67abfb683585ab35c7fb02036a4e857c28f4aff69c75b8aa4feeb0c458325
font_01_sfnt_off00008cce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8CCE 10500 bytes
SHA-256: 4028fb96327bb8869b65ca71e437a403eb0e0387c3d8f11633eaceb7d915a451
font_02_sfnt_off0000b0cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0CC 3280 bytes
SHA-256: 4c399bcd699bad01d30cb01580627cbf9c0d24b0a07b348c93c3c0a207ff48c3

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