Malicious PDF — malware analysis report

Static analysis result for SHA-256 181966cd18dbf681…

MALICIOUS

PDF

47.7 KB Created: 2020-08-07 05:06:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: b583b96a043ad01ee8a6e94a64578191 SHA-1: 82f5ce4ee19dcf2e4722964d1270acc84cb4db4f SHA-256: 181966cd18dbf681e48fc84f4798dde4f3fbaafadf6037a6b8307b8480fce4cd
234 Risk Score

Malware Insights

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

The PDF contains numerous embedded links designed to redirect users to malicious content, masquerading as legitimate downloads. Heuristics indicate it's part of an SEO link farm and uses a redirector to obscure the final destination. The ML classifier strongly indicates maliciousness, and the document body itself contains the primary redirector URL.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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.com/pify?keyword=adobe+illustrator+cs3+tutorials+for+beginners+pdf+free+download In PDF document text
    • http://luvewer.curlyhorsevermont.com/uploads/1/3/0/7/130776131/vatunosogovudo.pdfIn PDF document text
    • http://mexemegu.ifindoubttravel.com/uploads/1/3/0/7/130776728/6d9a2a77a4.pdfIn macro / runtime command snippet
    • http://files.furiousdaysk9.com/uploads/1/3/1/0/131070713/bae9a18ea0e0.pdfIn macro / runtime command snippet
    • 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/1/0431/6325/4944/files/bajudesixafilagiwovu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/22650439267.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5480/0797/files/17115591180.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/2331/6630/files/65909772375.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/0833/4744/files/bevoroleloxuki.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/9073/8328/files/caso_clinico_absceso_hepatico_amebiano.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7664/9124/files/91972745871.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/9212/3560/files/tracheostomy_complications.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/9359/9132/files/tivuboteme.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9289/4115/files/72762298711.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2757/0596/files/boxedotam.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006e35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E35 5588 bytes
SHA-256: 8bbd8e1a96fa5ddb0f067b207a7f85a87b99df91bfb5cf9a280d9f15490ae98c
font_01_sfnt_off00008148.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8148 9948 bytes
SHA-256: 47756d12d5e11aa812159829a52e6e749299860114811321c0ee94d01ce2e70a
font_02_sfnt_off0000a33b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA33B 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333