Malicious PDF — malware analysis report

Static analysis result for SHA-256 8655390d57ba0bda…

MALICIOUS

PDF

46.5 KB Created: 2020-10-31 12:31:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: a4ce6d14d2fc9a0fa9ca5118601cf938 SHA-1: 1a61510b2bfc59cc8fe6f223dfa4cfc9574531c1 SHA-256: 8655390d57ba0bdacc9d1d8451c3854f80baeb285fd8c774cd97ca0e7c7767b1
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with one identified as a malicious redirector. The document body, though partially obfuscated, includes the same malicious URL and other links, suggesting a link farm or SEO poisoning tactic. The primary malicious URL is likely used to redirect users to further malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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/123?keyword=kings+county+clerk+of+court In PDF document text
    • https://cdn-cms.f-static.net/uploads/4389793/normal_5f8e7c0c6d20f.pdfIn PDF document text
    • https://xosotujusosevo.weebly.com/uploads/1/3/4/3/134377620/nexanepumoledowim.pdfIn PDF document text
    • https://nitetezelimon.weebly.com/uploads/1/3/1/4/131438651/sijamatetiramojuwek.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374379/normal_5f8dd943e5d9a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386842/normal_5f9310658dc39.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/f39a2411-e7c9-4930-9913-ab21707e9fda/tilomuwe.pdfIn PDF document text
    • https://s3.amazonaws.com/tujeviwakirawu/azitromicina_suspenso_bula_profissional.pdfIn PDF document text
    • https://s3.amazonaws.com/bopuxosavubare/nutrition_during_pregnancy_and_lactation.pdfIn PDF document text
    • https://s3.amazonaws.com/mipeboro/makel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3dd10ab-0d7b-4364-b2ad-70216da5a752/79523377294.pdfIn PDF document text
    • https://s3.amazonaws.com/zesotat/tonto_de_capirote.pdfIn PDF document text
    • https://s3.amazonaws.com/vogubivajavofu/zombie_ate_my_neighbors_switch.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 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_off00006614.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6614 4856 bytes
SHA-256: 1f7b6610e26d197112f5d442dd51c2a69314fa8f7caffd2e52e22830ea386aac
font_01_sfnt_off000076b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x76B7 12816 bytes
SHA-256: 0d85c095494c8a9df53a96f4554a84c6e2f8120f67400c3b583ef4cb1550922b
font_02_sfnt_off00009f48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9F48 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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