Malicious PDF — malware analysis report

Static analysis result for SHA-256 18807b1b7e9a0c0e…

MALICIOUS

PDF

42.1 KB Created: 2020-09-18 05:32:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 2808e7e850533db19bf951aae3c53af7 SHA-1: 33ec3fead3d4a60691e5b3dcdad2831933f81c15 SHA-256: 18807b1b7e9a0c0e76b98b51b470be1b7c680ca5a3c75bd5e66536553a1faa37
194 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs pointing to redirector infrastructure, including a critical finding of a malicious redirector link. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains URLs that are consistent with a phishing or malware distribution lure, aiming to redirect users to malicious sites.

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.me/wix?keyword=steam+tractor+brands In PDF document text
    • http://kakika.febr-fdi.com/uploads/1/3/1/8/131857590/1203986.pdfIn PDF document text
    • http://files.talltechteacher.com/uploads/1/3/0/7/130775970/aea8677201f45.pdfIn PDF document text
    • http://lavadukul.tidytimeservices.com/uploads/1/3/2/6/132680981/5344373.pdfIn PDF document text
    • http://jamaj.theopenbus.com/uploads/1/3/2/6/132683138/vamusedejagi.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/1/0429/5920/8604/files/41563849218.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0465/2636/5854/files/libefiweripuxujos.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7301/1865/files/naxosotimijaratu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0450/1841/5254/files/xibuj.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9339/3557/files/lujisafixegiga.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3733/5464/files/cfmeu_2020_calendar_vic.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/2831/6313/files/zowipemedoguwasareliwewad.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_off0000589b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x589B 5036 bytes
SHA-256: 04b2affb6c64f747133585509a07a487c35a9e9c1f9fdc565d2ca6ce1f9eab54
font_01_sfnt_off00006980.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6980 10684 bytes
SHA-256: 17f2bbaa33b81931af626f374824e83fab104a30a0b4f8d2030f74d469652111
font_02_sfnt_off00008e0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E0E 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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