Malicious PDF — malware analysis report

Static analysis result for SHA-256 37ddd463e116ebb1…

MALICIOUS

PDF

42.7 KB Created: 2020-08-08 07:21:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: ec834207b42cf01e10224cb223937587 SHA-1: 92c8eaab5adf23c4627a6da6038545fabbcaead2 SHA-256: 37ddd463e116ebb17aae42b4b5caad8baf8d6675b7ea8f4259f4d669632218dd
194 Risk Score

Malware Insights

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

The PDF was flagged by multiple critical heuristics indicating malicious redirector links and a link farm. The embedded document body text, though partially corrupted, contains a URL that points to a redirector service. This suggests the primary purpose is to lure users to malicious sites, likely for phishing or malware delivery.

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=ordering+numbers+worksheets+for+grade+1+pdf In PDF document text
    • http://files.jqacademy.org/uploads/1/3/1/8/131872087/vaguwonul.pdfIn PDF document text
    • http://files.ebenezerconyers.com/uploads/1/3/1/4/131408537/5101117.pdfIn PDF document text
    • http://files.hordlevoluntarycare.org/uploads/1/3/0/8/130874413/zoladamalija.pdfIn PDF document text
    • http://files.sra-sandiego.com/uploads/1/3/1/4/131438392/cd3d03.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/1/0440/8298/7173/files/46714812216.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2718/5311/files/rawuneposufedijov.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/4389/8019/files/62481051803.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/8368/5274/files/41468685756.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/8100/6246/files/mobile_technologies_and_augmented_reality_in_open_education.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/2873/2314/files/fixurinunumevamuwifuxu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/5863/3631/files/jazukugepudozepux.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2439/2087/files/acs_study_guide_general_chemistry.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6124/7129/files/78041193878.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/9710/4288/files/temarovutamelex.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9508/1635/files/15918220199.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9623/6447/files/sudipijujuxufozunirugute.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_off00006701.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6701 5796 bytes
SHA-256: a2c75d9a5c56b727b4fca146cf551cff21b775fdb81a9441f1f32a0df449b689
font_01_sfnt_off00007aab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7AAB 10100 bytes
SHA-256: f92ac13389cdf1e6bd22d7ff440732e80428e7a9fda1cb0087b1c330d1356d01

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