Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d3604009963b9b8…

MALICIOUS

PDF

40.1 KB Created: 2020-08-25 19:26:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 55d2e14d2188c48d56e882213e0f3af3 SHA-1: 38c21d995498de844b8adc0866136f3b05cba0ac SHA-256: 3d3604009963b9b857c2815c556c5249bfa74edbbcdcb93c4acde9e82ff1663d
194 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with one critical heuristic firing indicating a link to known malicious redirector infrastructure. The embedded URL leads to a redirector that appears to be part of a SEO link farm, likely intended to host malicious content or phishing pages. The document body contains text related to 'ap computer science principles practice exam' and includes the malicious URL, suggesting a lure to trick users into clicking the link.

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.me/pify?keyword=ap+computer+science+principles+practice+exam In PDF document text
    • http://limijile.millersgardenservices.co.uk/uploads/1/3/1/4/131438268/04f536.pdfIn PDF document text
    • http://files.ksasteel.com/uploads/1/3/0/7/130776743/favemabirulavo.pdfIn PDF document text
    • http://files.bigobikeshop.com/uploads/1/3/2/6/132683070/dajufinovokesifomer.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/1/0433/9780/8279/files/tutorial_cade_simu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/7400/9753/files/69439284714.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0631/2098/files/83507780022.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6643/3429/files/frankenstein_2015_parents_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/14981909947.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/9684/2142/files/juwaxewo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3550/8387/files/73573865523.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/7791/9129/files/liruzifisaseso.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1547/0245/files/sadeboliraxikiwukadufiz.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_off00005d45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D45 5136 bytes
SHA-256: 5f23c5c1905ccff8ea027984ae4c13b0709192c72f341e6fc399e424955b7899
font_01_sfnt_off00006ea1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6EA1 11012 bytes
SHA-256: 957da2d9b2761a2c4a22dd838091f3f1adbdff11b96f93be1b28dc5d17f23e5d

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