Malicious PDF — malware analysis report

Static analysis result for SHA-256 8739a442bb582afa…

MALICIOUS

PDF

46.9 KB Created: 2020-08-05 06:29:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-07
MD5: 140d268b7404f2e30cba24d21425ca64 SHA-1: 1ae619213ddb290e06394c7d981f84c4b921d911 SHA-256: 8739a442bb582afa5bf2c60609b93e36d39208df8d5fe1f027b097b7dfb480d3
194 Risk Score

Malware Insights

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

The PDF contains a link to a malicious redirector, https://ttraff.com/pify?keyword=precalculus+book+pdf+download, which is part of a link farm designed to appear as legitimate free PDF downloads. This suggests a phishing or scam attempt, likely using a spearphishing attachment as the initial access vector. 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.com/pify?keyword=precalculus+book+pdf+download In PDF document text
    • http://files.tcapaving.com/uploads/1/3/2/3/132303261/9586986.pdfIn PDF document text
    • http://putog.verisoftgroup.com/uploads/1/3/0/7/130738836/sinogojixarajira.pdfIn PDF document text
    • http://files.maddiebooks.com/uploads/1/3/2/6/132682792/zesatawuvemu_zofabaxalogezaj_mavujenatijit.pdfIn PDF document text
    • http://files.imagesbylesrigby.com/uploads/1/3/1/4/131455621/66425c63f2b.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/1/0435/7577/1304/files/69110816275.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0426/3585/files/37718361502.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/3039/5552/files/betty_lukens_teacher_s_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/7208/6423/files/11969109577.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6761/3087/files/nutrition_free_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8269/4312/files/32180531143.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/84312174386.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/82505274200.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5956/8027/files/56929030562.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/2571/8678/files/latudeguledexiweduteroda.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9076/3175/files/fasituw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/8161/9861/files/axis_allies_d_day_rules.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/3489/3721/files/13339652650.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 6

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_off00007a31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7A31 5444 bytes
SHA-256: ca92dc919acb5d918b5e5855c1ba92b203b2a727ee18a4d80c4453636bf6ecd6
font_01_sfnt_off00008cd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8CD1 9928 bytes
SHA-256: 6e3b4759f53aef5e92c308ad0ba29cec29624fd0dbde20a3be9b45c48db3bbe9

Open this report in the interactive analyzer, or submit your own file for analysis.