Malicious PDF — malware analysis report

Static analysis result for SHA-256 812aca5a1bed79b5…

MALICIOUS

PDF

46.8 KB Created: 2020-08-15 02:52:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 82c779c75c10e3e6f0edd919fa74a147 SHA-1: 25cfc6b715894422097959966a1d7264644b16a6 SHA-256: 812aca5a1bed79b53c1eb966d22b2e77a5eef6059b9386f7524e0ff94b9773ff
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for a malicious redirector link, which is also present in the document body. This link, 'https://ttraff.cc/wb?keyword=basic%20medical%20endocrinology%20goodman%204th%20edition%20pdf%20download', is designed to trick users into downloading further malicious content by impersonating a legitimate file download. The presence of numerous other PDF links further suggests a link farm or SEO poisoning tactic.

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/wb?keyword=basic%20medical%20endocrinology%20goodman%204th%20edition%20pdf%20download In PDF document text
    • http://xogarenu.garnerbass.com/uploads/1/3/1/4/131407440/leniwokonefupus.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/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/1/0431/5149/1233/files/vumelekoj.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/2866/7816/files/stuffit_expander_mac.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/8136/6693/files/bopob.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/4796/0232/files/filipino_knife_fighting_techniques.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/2940/4567/files/64437175843.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/1493/8014/files/defined_and_undefined_terms_in_geometry.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/3510/6203/files/26332849745.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5107/3174/files/89200956269.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0185/5646/files/selinasapedug.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 1

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_off00006d58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D58 2184 bytes
SHA-256: 0297fe122cadb3576b993b0ffbe7ad37f917d0dc05d284c17f572152ad3959dc
font_01_sfnt_off0000770f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x770F 5900 bytes
SHA-256: 2608471b2276f0cce40d2e57441bda02154aef80a48151486fe729b2cccb2678
font_02_sfnt_off00008b0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B0E 10196 bytes
SHA-256: 4fd09ba011afb042cbc7759117cdfb230f30b96a7bac2954ed44ed48d1ed75f4

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