Malicious PDF — malware analysis report

Static analysis result for SHA-256 634a053238b47946…

MALICIOUS

PDF

43.9 KB Created: 2020-09-01 07:13:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 7a9c4b56426b4a654463aaad2f8ac587 SHA-1: 2864ed85a035220b6d7d5afa9bdf07c375360088 SHA-256: 634a053238b47946b05a6152971941c0020e57b8d9d811264f4af1f6e0338da5
194 Risk Score

Malware Insights

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

The PDF contains a link that redirects to a malicious URL, disguised as a worksheet answer key. This is further supported by heuristics indicating the PDF is a malicious redirector and part of a link farm. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the embedded link is the primary indicator of malicious intent.

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/wix?keyword=nuclear+equations+2+worksheet+answers In 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/1/0440/6837/2632/files/2006_gmc_envoy_repair_manual_files.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/7141/3160/files/46853304013.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1393/0142/files/31432751537.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/d5415a_6b32fcce8fe2430a94c5af111043c664.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/48f461_e5ac66c40363408ea220e4259deebcf3.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/2288/3735/files/classroom_management_in_english_language_teaching.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/8080/0674/files/39596294790.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0165/1105/files/dediser.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/0367/4785/files/auxiliary_verb_do_exercises.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/9359/9132/files/mudixujetuxekoxu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/9416/3109/files/bentley_repair_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/1742/7352/files/i_wrestled_a_bear_once.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005877.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5877 5272 bytes
SHA-256: be26df9cb5fb8dc5891123cd6b33149d66fddda199c66aefde012d11aabf89ef
font_01_sfnt_off00006a7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6A7F 10336 bytes
SHA-256: 3676baa2ba56f1d3de5ddca4e320367d355f4caa756503eee2e4a63e2664701b
font_02_sfnt_off00008e03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E03 16080 bytes
SHA-256: 01918ab328aad74c9e8f640f01f786fd0c2e0e9f3673bd8045474dd117871356

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