Malicious PDF — malware analysis report

Static analysis result for SHA-256 158aabf5167eaeb6…

MALICIOUS

PDF

58.2 KB Created: 2020-09-29 20:48:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 62a14dfba5bed2802397d497b58a32ee SHA-1: b00472473f705281a67439e8d6ba82ea4920c741 SHA-256: 158aabf5167eaeb6066f4e33334dd5e5d7a8b94e67d59422a0bb77082910edea
194 Risk Score

Malware Insights

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

The PDF file contains numerous links designed to redirect users to malicious infrastructure, masquerading as book downloads. The heuristic firings indicate the use of redirector links and an SEO link farm to distribute these malicious PDFs. The ML classifier strongly suggests malicious intent, and the embedded URLs point to known malicious redirectors.

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://gettraff.ru/strik?keyword=baylee+jae+book+pdf In PDF document text
    • http://files.erdius.org/uploads/1/3/2/8/132814371/9652316.pdfIn PDF document text
    • http://files.elementssalononline.com/uploads/1/3/0/8/130874143/422de05a6b.pdfIn PDF document text
    • http://ruxik.cloakroomtheatre.co.uk/uploads/1/3/0/7/130739164/9357618.pdfIn PDF document text
    • http://kubalov.nudosphynx.com/uploads/1/3/1/4/131453645/xaparumuxuvegis.pdfIn PDF document text
    • https://site-1037149.mozfiles.com/files/1037149/64285024793.pdfIn PDF document text
    • https://site-1036991.mozfiles.com/files/1036991/jumibe.pdfIn PDF document text
    • http://pazuzexod.casaungherese.org/uploads/1/3/1/6/131637257/68e0b829e9a1a.pdfIn PDF document text
    • http://files.santiagos.co.uk/uploads/1/3/2/6/132682785/morutajozodeme.pdfIn PDF document text
    • http://bidovot.cffighters.org/uploads/1/3/0/9/130970004/6753457.pdfIn PDF document text
    • http://files.imajicatheatrecompany.co.uk/uploads/1/3/0/7/130775229/xavabelufizudamowope.pdfIn PDF document text
    • http://files.dorewe.com/uploads/1/3/1/3/131398542/8290615d9.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/1/0431/1518/4290/files/finozenoj.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4886/9786/files/dunufu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/1123/4197/files/spell_of_the_sensuous.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/8935/3117/files/25724078446.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/5104/7329/files/18906650299.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009809.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9809 5192 bytes
SHA-256: 4994b0720073f12dcc10595362e7ad339f758b80fe58e0794864ec637108c267
font_01_sfnt_off0000a9d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA9D8 15652 bytes
SHA-256: 13d037de2e0e3753a9c1a41b42b8d54b99fe39709181fdc935ea1bb832307033

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