Malicious PDF — malware analysis report

Static analysis result for SHA-256 685d3182289c3412…

MALICIOUS

PDF

44.1 KB Created: 2020-08-14 15:45:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-07
MD5: 054026acd12f89602cb2ea4010d8ae76 SHA-1: 381616aac4db861165a7538f743ab03a0c6161a7 SHA-256: 685d3182289c341229d556f6fb8f9411fb14001a7e17a166bae1f9c8be69149d
234 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links designed to appear as a free book download resource, but these links redirect to malicious infrastructure. The document body itself contains obfuscated text and URLs, including a primary redirector URL. The presence of a password-protected archive lure suggests an attempt to bypass gateway scanning.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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=baixar+livros+gratis+em+pdf+passei+direto In PDF document text
    • http://files.leapingllamas.com/uploads/1/3/1/6/131636737/3c706f63ece9f4c.pdfIn PDF document text
    • http://files.nestleinnbb.com/uploads/1/3/0/7/130775837/winimusetux-nuxoni-gimosu-gujob.pdfIn PDF document text
    • http://files.thebookthateveryoneshouldhave.com/uploads/1/3/1/4/131454373/7321702.pdfIn PDF document text
    • http://tokik.goodshepherdinoshkosh.com/uploads/1/3/1/4/131406970/puposakazox.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/1/0428/1758/5308/files/andrographis_paniculata_uses.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2359/6693/files/wuvax.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/8275/2935/files/7660866143.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/0912/1184/files/alphabet_animals_flash_cards.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/2240/9125/files/73560100897.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/2490/6400/files/59111410876.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7243/7910/files/wupop.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/8935/3118/files/pujojidelexetilulobofiso.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/8978/7048/files/tezatojajuvobi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2812/7645/files/kuzow.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/5312/8612/files/9683969542.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5663/5816/files/kufapewuzotezatila.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 5

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_off000066b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x66B3 5536 bytes
SHA-256: 3cdc1b04ce29a86c97f8ae1d187a2c828e23dc8cb73866ea8116c3b4c63e4976
font_01_sfnt_off0000797c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x797C 13012 bytes
SHA-256: 9e02d8f528a30851752689116b581fce36dad14c3f15afdbcc66d4d3ec0ba93c

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