Malicious PDF — malware analysis report

Static analysis result for SHA-256 55c03cc38d7aea08…

MALICIOUS

PDF

45.7 KB Created: 2020-09-18 09:24:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2a00d26f8ddf9d7423b03ca957538489 SHA-1: 21a773e3e9255d9d72c519da11722ecb42994e65 SHA-256: 55c03cc38d7aea085207fb9edb7671bab1910717889d9f8993430585dbaad332
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a significant number of embedded URLs, many of which are identified as malicious redirectors or part of a link farm. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' indicates that at least one URL leads to known malicious infrastructure. The 'PDF_SEO_LINK_FARM' heuristic further suggests a large number of external links, likely intended to manipulate search engine results or lure users to malicious sites. No scripts were extracted from this sample, and the document body is heavily obfuscated.

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.link/wix?keyword=beamed+eighth+note+beats
    • http://files.wisefirstgrade.com/uploads/1/3/1/4/131438474/6666645.pdf
    • http://files.alphaobsession.com/uploads/1/3/2/6/132695633/texijotixuvuwos_pufabusaligug.pdf
    • http://files.sharpeningdoneright.com/uploads/1/3/0/7/130740412/23bf8.pdf
    • http://fevaf.jeanhuguesmiredin.com/uploads/1/3/1/4/131453520/8368924.pdf
    • http://filejeguz.datument.com/uploads/1/3/1/3/131398134/e22b4fc9cc.pdf
    • https://cdn.shopify.com/s/files/1/0431/7233/1675/files/kaludevuzokogaxej.pdf
    • https://cdn.shopify.com/s/files/1/0434/7982/6582/files/add_ons_firefox_internet_manager.pdf
    • https://cdn.shopify.com/s/files/1/0429/9181/2771/files/alimentacion_saludable_introduccion.pdf
    • https://cdn.shopify.com/s/files/1/0485/9808/9888/files/simple_confidentiality_agreement_template_word_free.pdf
    • https://cdn.shopify.com/s/files/1/0432/1378/3199/files/42464152072.pdf
    • https://cdn.shopify.com/s/files/1/0477/6483/2412/files/bipiladeguvavuzajefa.pdf
    • https://cdn.shopify.com/s/files/1/0431/3609/0267/files/picsart_photo_collage_apk.pdf
    • https://cdn.shopify.com/s/files/1/0438/8628/0872/files/gumaluzudusofifuzagepa.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006a90.bin
9e413555cda8dea751ae75704d558249b9e79ef167547b3eec41b128fafacd01		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A90 5300 bytes
font_01_sfnt_off00007c66.bin
b075b7658c0a58b08178d246d5df374084e3fe5d5c7c8c32c055e9f06503b614		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C66 2448 bytes
font_02_sfnt_off000086ee.bin
81d2d13e955cf5a40aa5beae537ec6c21aa65855b0d38559f213b4dfbc7da2ec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x86EE 10256 bytes

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