Malicious PDF — malware analysis report

Static analysis result for SHA-256 18b6c8f21a734eb7…

MALICIOUS

PDF

43.0 KB Created: 2020-08-30 19:08:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 85d3b9bfe67faea2e4f66f2ef975af3f SHA-1: 041bfd6620497424542698348bd680e5ea0617c2 SHA-256: 18b6c8f21a734eb787bf99b3d14d9108eba613e78451d239353b57d533c9d741
194 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to a known malicious URL, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though obfuscated, contains text related to a transistor and the malicious URL, suggesting a lure. The ML classifier also strongly indicated maliciousness. The presence of multiple links to external PDFs, some benign and some potentially part of a link farm, further supports a malicious intent to drive traffic to potentially harmful 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.cc/wix?keyword=transistor+d882+pour+que+sert In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_8c206f1c44d043f999a4bb4ab4a159e7.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/fb83f1_76fb0b6ee4284f9f997a95d08abd1c83.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/05900a_2acacb5ad944400689520cc6be1a3d68.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b91566_8121f4de6ed148c9a7223b9b34b7df8f.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_cb33a94129224f33a0713f8beccb0603.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_1b7f6d56d00a4744b1b7a919d099f89e.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/47b1e8_201c8af0fc6b4b188105a785cb32500a.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/6cfc61_b30bc349a33840f498c6e826ec870dda.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_b6a0ebf5e62b41959ccab27757b75fee.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/4d400c_146a160c7b724710a97d921cafec3f8d.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/af0aa9_3ef5db47b2f34e3888bbc96ded78f930.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/dd4472_25dc5353234a4c168087ba2d03b94c78.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/8a419d_f625eb80993641449a34f7439c9b7014.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 2

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_off00005ce7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5CE7 3044 bytes
SHA-256: d4e0b2484977518ac65d478fdfcf86ae5a183c6190c5e600535bca891b683588
font_01_sfnt_off0000679d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x679D 5324 bytes
SHA-256: 092af2bf5786d85013da4d6fa9162be64e560a5c8f06f5a6517436d2d75962c8
font_02_sfnt_off000079b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x79B8 10480 bytes
SHA-256: 66b7f61405968ce17f0afb9225eb5453f65ac141659fdcd479d71dbecdae3ba7

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