Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5ef7c14d5771aba…

MALICIOUS

PDF

44.5 KB Created: 2020-10-31 08:42:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 3ed478afe64851f2d8d33ab6c50b70a9 SHA-1: 25e1831d865d85d9c58df85f31e4ead304330af9 SHA-256: f5ef7c14d5771abab4422f8edc5c840dc960f8a6f6422255cd76e7f715b6a35a
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, including a critical redirector to a known malicious domain, indicating a phishing or scam attempt. The ML classifier also strongly flagged this PDF as malicious. The document body itself is largely obfuscated but contains the malicious URL, reinforcing the phishing lure.

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://cctraff.ru/aws?keyword=bsa+outdoor+code+poster In PDF document text
    • https://cdn-cms.f-static.net/uploads/4369903/normal_5f880b8f5395e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390329/normal_5f8db70f4e02f.pdfIn PDF document text
    • https://mofivekirupu.weebly.com/uploads/1/3/2/7/132740685/pimexepapuxulapurek.pdfIn PDF document text
    • https://jubozofarubowi.weebly.com/uploads/1/3/4/0/134095851/6129086.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/1/0431/1564/3031/files/lamb_loin_chops_cooking_instructions.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/6248/4383/files/mamebinerufilidu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0479/4721/9100/files/64488471324.pdfIn PDF document text
    • https://s3.amazonaws.com/tenunud/fexagilowa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0478/2931/9839/files/83021605463.pdfIn PDF document text
    • https://s3.amazonaws.com/juvuraguvutoxif/class_dojo_monsters.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0268/8303/1237/files/jazexuxulule.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4fc5599-88e8-466f-9422-979a6c89cc14/76371479904.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000066b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x66B5 5084 bytes
SHA-256: a582f569d8faaad13d6b0f62faa80d0a284d5385f17898ce0b6096e9f98226c9
font_01_sfnt_off00007808.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7808 1800 bytes
SHA-256: e9a5a1f6ed95b1e3669933bb00002ad32a1708c3e0b735191cad5e02368a6c7d
font_02_sfnt_off00008096.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8096 10804 bytes
SHA-256: a8f311aaa66f9abd5c27d63008a2cebd8963c4c382575034fb327218a8dd2272

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