Malicious PDF — malware analysis report

Static analysis result for SHA-256 b18eb71971b05794…

MALICIOUS

PDF

80.2 KB Created: 2020-08-10 05:19:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 2478a36e2dfcf10ed60cb3f89aed494e SHA-1: 50d1eb9efe962af456a5606319f2b17612de8c4d SHA-256: b18eb71971b0579425715d14d27276896f794d22311dac41ada05aba2e1d6d6b
202 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains multiple embedded links, with a critical heuristic identifying a malicious redirector. The document body and heuristics indicate an advance-fee scam lure, disguised as a downloadable academic paper. The primary malicious IOC is the redirector URL, which likely leads to further malicious content or phishing pages.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=alagappan+clinical+medicine+5th+edition+pdf+download In PDF document text
    • http://fujok.annawitte.org/uploads/1/3/0/9/130969057/cd3126597.pdfIn PDF document text
    • http://gedeze.kimbarrystudio.com/uploads/1/3/0/7/130775413/3655507.pdfIn PDF document text
    • http://lozolexa.davideagle.ca/uploads/1/3/1/8/131857631/ninizoze_sisajugabetide.pdfIn PDF document text
    • http://files.elizabethkburns.com/uploads/1/3/1/4/131453193/jatujubifonivawutire.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/1/0434/0069/1866/files/worldmark_encyclopedia_of_cultures_and_daily_life.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7080/7459/files/msds_acido_citrico.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/1402562920.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6976/7842/files/20234257046.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/0982/7231/files/xomowetowi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/4976/3487/files/practice_act_tests.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/8322/5506/files/44759000332.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2128/7080/files/vuzusakobejijaxa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/2421/1354/files/82125551064.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/9889/7574/files/45810417485.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9246/7109/files/zotabiwegatafexalufow.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0204/4316/files/aldehidos_y_cetonas_quimica_organica.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_off0000f527.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF527 5500 bytes
SHA-256: adf046b125dc2f31152921a63ae7f4d7db8297a5e8389479a2657ecb9c7676d2
font_01_sfnt_off000107d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D9 13496 bytes
SHA-256: f2b675dbbf60d44ca9ec2d805a476f299869b64001023540f5223a210d1b2fba

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