Malicious PDF — malware analysis report

Static analysis result for SHA-256 155753fe8967e594…

MALICIOUS

PDF

42.2 KB Created: 2020-08-14 23:29:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: cf50116353cef3ca198481f02f32a63a SHA-1: c99d3dce96ffc9393a1eb2fe3efad04890a6c2ec SHA-256: 155753fe8967e594b3256aa85ef652c3fe34cade15519b5ba1b6a169b89f37f1
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 pointing to external PDF files, and one prominent link to a redirector URL. The document body text, though corrupted, contains the phrase 'Abstract algebra books pdf' and the redirector URL, suggesting a lure to download academic materials. The ML classifier strongly indicated maliciousness, and the PDF structure with numerous external links is consistent with SEO poisoning or link farm tactics to distribute malicious content.

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=abstract+algebra+books+pdf In PDF document text
    • http://files.kpuhra.com/uploads/1/3/1/6/131637224/323866.pdfIn PDF document text
    • http://files.portraitreflections.net/uploads/1/3/0/8/130874146/9783001dddc0e42.pdfIn PDF document text
    • http://files.hannahjrule.com/uploads/1/3/2/7/132740277/kusivezawate-fitiw.pdfIn PDF document text
    • http://files.appalachianwild.org/uploads/1/3/0/8/130874045/zoxozafabo.pdfIn PDF document text
    • http://files.karenmussernortman.com/uploads/1/3/1/0/131070867/7c22e82225116c.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/1/0433/8132/5987/files/86236052226.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/8638/0197/files/vitatunufaxi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5496/4629/files/sopotizakozowezewuredoxa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0443/9562/6662/files/bee_story.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/4488/1059/files/53107301861.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/1723/8688/files/the_blood_mirror_brent_weeks.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/7133/2767/files/18348310951.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8259/6008/files/unscramble_words_worksheet_for_grade_4.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_off0000650c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x650C 5516 bytes
SHA-256: 156523d3ee1723b86ee209dcf56df72fe7aa56ce19f4a6add7bc0e14d4bbf097
font_01_sfnt_off000077ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x77CE 10696 bytes
SHA-256: 6ae1e96f2ccd9696b4eac0c96b569a992a6fe6909ea93416e97dac5dac83c61e

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