Malicious PDF — malware analysis report

Static analysis result for SHA-256 18ac161143bd751e…

MALICIOUS

PDF

61.9 KB Created: 2020-08-21 23:38:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 65c6fe1b3325f305e6dc755b334b32de SHA-1: 642719339c18d7e952125a82f8ad768f2653672a SHA-256: 18ac161143bd751e29376d174f2afb06a02d41c077901a1803ce85361e8a959b
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a link that redirects to a malicious URL, identified as a redirector for potentially harmful content. The document body, though heavily obfuscated, contains the same malicious URL, suggesting a phishing or scam attempt. The presence of numerous links to external PDFs, many hosted on Shopify, indicates a link farm designed to obscure the true destination and potentially spread malware.

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=stranger+things+season+2+episode+guide+spoilers In PDF document text
    • http://files.mushini.net/uploads/1/3/0/7/130739379/416571.pdfIn PDF document text
    • http://files.sunsetparkcarservice.com/uploads/1/3/0/8/130874369/9783279.pdfIn PDF document text
    • http://files.dekalbtennessee.com/uploads/1/3/1/1/131164236/penivumiruguvemeniw.pdfIn PDF document text
    • http://files.tranquilpalmsmaui.com/uploads/1/3/0/7/130739274/8604543.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/1/0434/4876/2529/files/bufaseritexitenovu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/5158/1597/files/7435358175.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/1910/6466/files/ashrae_handbook_hvac_applications_2020.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/8508/4310/files/24078043520.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1284/8790/files/duzomut.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/1805/1996/files/lipid_profile_test.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0450/6550/2872/files/bending_stress_nptel.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rinubigelezegir.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9275/5111/files/historia_de_las_brujas.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5656/1318/files/benzoato_de_sodio_usos.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5670/1348/files/88464604693.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4493/7628/files/dufikaponolelegaj.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1896/0545/files/abundant_life_bible_study.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7372/3800/files/wagonivebubabemaje.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0455/4991/2229/files/donepezil_davis.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b452.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB452 5456 bytes
SHA-256: c1af86c59ea6d131fd33f18d3e2fa8d0b02861cc51ff5b988c4cd2956d6a1924
font_01_sfnt_off0000c6ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6CA 10320 bytes
SHA-256: bcf3bd84835a89e780d0a6f216b2905d047c6730fe4566d54de114458fd50cc2