Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe246e70fdea1f25…

MALICIOUS

PDF

41.5 KB Created: 2020-11-03 14:39:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 81f6aa81a2be701b27b7e90e674ebfc8 SHA-1: 30b94a8fc341dcba5502c74305138cf3dfda83f7 SHA-256: fe246e70fdea1f25e22f03ed58149e74d26bbd3181d12995f6f8e718fcaa1f7b
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, with one specifically identified as a malicious redirector. The document body, though heavily obfuscated, contains text that appears to be search query terms, suggesting a tactic to make the links seem relevant. The presence of a link farm and a malicious redirector indicates an attempt to lead the user to harmful content.

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.club/123?keyword=lawrence+high+school+lawrence+ks+66046 In PDF document text
    • https://besajiti.weebly.com/uploads/1/3/1/8/131856076/pidefi.pdfIn PDF document text
    • https://mawoluji.weebly.com/uploads/1/3/4/2/134265904/5388693.pdfIn PDF document text
    • https://jodotabamusunew.weebly.com/uploads/1/3/4/4/134402052/dakemivewokalapen.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368489/normal_5f9e456be1a62.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jukoxisojow/kuwujixutizojizup.pdfIn PDF document text
    • https://s3.amazonaws.com/wotodedaruzuk/73450861316.pdfIn PDF document text
    • https://s3.amazonaws.com/bulozor/xowimoxajibova.pdfIn PDF document text
    • https://s3.amazonaws.com/tudawufed/ropozobifoxigizuvatukuf.pdfIn PDF document text
    • https://s3.amazonaws.com/zupenafud/exploring_american_histories_volume_2.pdfIn PDF document text
    • https://s3.amazonaws.com/divelatoxa/granada_hills_library_phone_number.pdfIn PDF document text
    • https://s3.amazonaws.com/kavitokolezub/42419031135.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005e61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E61 5544 bytes
SHA-256: 640fb5906bc5b7b09021bdf6e43bcf55bafc68bc3bd202ba3d31b7a9f3f62d8a
font_01_sfnt_off00007159.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7159 12520 bytes
SHA-256: 3328d55e812a6af978b09f0a70b145909f6d97ed2fefbcab0e1d0ea43ab58ccd

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