Malicious PDF — malware analysis report

Static analysis result for SHA-256 72138a1f8fc20d7b…

MALICIOUS

PDF

54.1 KB Created: 2020-08-23 10:55:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 526f22df6c2af9f9d6f12e24750d6830 SHA-1: ea26f367aeb0a66e50fb2e00edfd5eb9e1b3cb04 SHA-256: 72138a1f8fc20d7b1942c236b8a5f3f8e9eae2fc86889e42e1415cc6e139c899
194 Risk Score

Malware Insights

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

The PDF contains a mass of external links, many of which point to a redirector service known for hosting malicious content. The document body, though heavily obfuscated, contains a URL that is also present in the heuristics, indicating a likely phishing or scam attempt to redirect users to malicious infrastructure. The ML classifier strongly supports the malicious verdict.

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=bootstrap+3+video+gallery+template In PDF document text
    • http://files.ktdidcollections.com/uploads/1/3/1/4/131408024/purizisepuj.pdfIn PDF document text
    • http://files.positivegundogsmn.com/uploads/1/3/1/3/131380471/9407882.pdfIn PDF document text
    • http://files.charadams.com/uploads/1/3/1/1/131164417/nijurubixa_nivesojifa.pdfIn PDF document text
    • http://vefarebol.casamaxi.com/uploads/1/3/1/6/131606289/7dbca11c.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/1/0435/3818/6394/files/basic_auto_repair.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6732/6110/files/poker_face_clarinet_sheet_music.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/9654/7230/files/33027680249.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6938/2568/files/arthrocare_coblator_service_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6254/1982/files/tulajiwijonopigi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/4485/4165/files/gijovasemamased.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5557/8273/files/ideological_state_apparatuses_are_nonviolent_social_formations.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2341/6995/files/jelurebijofixibizakiru.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4526/5318/files/82630382394.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8266/1526/files/kung_fu_panda_games.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 4

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_off00009579.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9579 5652 bytes
SHA-256: a33b892eec33d6b5a02b0ebbb4083d41dc81b52dda215376152e1a94532c9a8a
font_01_sfnt_off0000a8a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA8A6 10152 bytes
SHA-256: 3249faf844faa2170aca834b0c7f15d388a2b47fe92941eeb56765bb3fa1c0ce

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