Malicious PDF — malware analysis report

Static analysis result for SHA-256 81d154f3a9579302…

MALICIOUS

PDF

40.7 KB Created: 2020-11-05 07:13:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: a36dfcfcd6fbbb2122dd4025a5ca76b6 SHA-1: 8a0be035cd9d749526d14257d382e90a1047ab28 SHA-256: 81d154f3a957930205071d12875360c99d30745e95074221d24b1c15bd47af6d
134 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains embedded links that redirect to a known malicious infrastructure, identified by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The document body text, though heavily obfuscated, contains a URL that matches the redirector found in the heuristics, suggesting a phishing or malware distribution lure. The ML classifier also strongly indicated maliciousness.

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.
  • 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.link/123?keyword=lighting+fixtures+at+menards In PDF document text
    • https://zizuralozirufu.weebly.com/uploads/1/3/1/4/131483034/murezumavul.pdfIn PDF document text
    • https://lokixesope.weebly.com/uploads/1/3/1/6/131607163/656ac77e86.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365620/normal_5f9cf7f9651d0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368248/normal_5f9015d17fb02.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366668/normal_5f87c477cfd62.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365661/normal_5f8735690f130.pdfIn PDF document text
    • https://kutenamig.weebly.com/uploads/1/3/0/7/130740069/xakokokel-zadagefaboli.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457006/normal_5fa360227dbf0.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://s3.amazonaws.com/vuliwisuwig/6143725809.pdfIn PDF document text
    • https://s3.amazonaws.com/senodiw/mathematics_syllabus_d_thinking_process.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68819bb0-3502-41e0-abe4-424fe8727610/88238182118.pdfIn PDF document text
    • https://s3.amazonaws.com/jesidofefe/cells_and_their_environment_worksheet_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cfd73cb4-0ca8-4a2a-b8fe-c5d4ae27635f/jojigizuvip.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004950.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4950 5068 bytes
SHA-256: 0899af1adc3e0206bc934602f4ecea9daceb90cb84b9e12a387603dd0e8a2f50
font_01_sfnt_off00005a58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5A58 1800 bytes
SHA-256: 6d2a3a16cc464ce72cf05976c7f96a31c93af2202e0dc760c37a694345e222ee
font_02_sfnt_off000062e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62E8 10704 bytes
SHA-256: ed58ffd8338550a54c73d1830c7a2942fda91d7fb7a4483ed6bfa5401f05ed3d
font_03_sfnt_off00008718.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8718 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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