Malicious PDF — malware analysis report

Static analysis result for SHA-256 874ec439fa81f9d3…

MALICIOUS

PDF

37.8 KB Created: 2020-08-25 08:05:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-07
MD5: 1d59c7ce3c0446969c42be93ee1890e0 SHA-1: 08016bd0d9f83893ece973fa5cbea66e328dd720 SHA-256: 874ec439fa81f9d3568cfd6b85479824a1f9010c592c166bead8a00a195aa037
194 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a redirector URL. The document body text, though heavily obfuscated, contains the same redirector URL, suggesting an attempt to lure users to malicious infrastructure. The ML classifier also strongly indicated maliciousness.

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.ru/pify?keyword=this+is+amazing+grace+chords+pdf+b In PDF document text
    • http://files.vertecreative.com/uploads/1/3/0/9/130969472/tapogid.pdfIn PDF document text
    • http://files.edcentricteaching.com/uploads/1/3/1/4/131453021/doletafapu-taxowutoboge.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/1/0432/9819/3573/files/66411788536.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6308/3162/files/95797269687.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/bugasodaliza.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/2146/5757/files/pofil.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2439/2087/files/gubudezidufevozerob.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5850/3573/files/33247569506.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/5198/3783/files/medanipuvixufebixewo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/8308/6489/files/micromax_mobile_brand_fusion_ringtone.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/3612/0990/files/68926306032.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/1962/4870/files/vezan.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2639/8888/files/77795786632.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8484/1124/files/ropevivujuduvod.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
🗂 Part of campaign: edcentricteaching.com 3 samples

Related samples 2

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_off00004ddf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4DDF 5676 bytes
SHA-256: b8c9a524c3d6caa3261a67ff0b7cd40f04c505dd29496f6aa0a8f7a1aec6de59
font_01_sfnt_off000060fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60FD 13172 bytes
SHA-256: 788d261dd685aabb8955d0bc55f9fad2614190f5401ba89c950f45f75eb3ac65

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