Malicious PDF — malware analysis report

Static analysis result for SHA-256 21f14cc1654abdf7…

MALICIOUS

PDF

49.0 KB Created: 2020-08-12 02:39:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 210a46e1e4841a675d2bce8964016a71 SHA-1: 2b13cdb74e5dfd8aab27372c4bd7fd7119723d86 SHA-256: 21f14cc1654abdf76316894fa696845e637b52d97d255171d70ab7a4a64a62e2
154 Risk Score

Malware Insights

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

The sample is a PDF file that contains a large number of embedded links, many of which point to external PDF documents. One of the primary links directs to a known malicious redirector. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the structure and embedded links suggest a malicious intent, possibly for SEO manipulation or to distribute further malicious 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.cc/pify?keyword=2020+ford+explorer+specs+pdf In PDF document text
    • http://files.burghyart.com/uploads/1/3/1/8/131871772/vevelu.pdfIn PDF document text
    • http://files.bitsnpieces.ca/uploads/1/3/1/4/131407977/1068346.pdfIn PDF document text
    • http://files.local811houston.org/uploads/1/3/1/6/131606011/5764455.pdfIn PDF document text
    • http://wimixofi.marthaannepalmer.com/uploads/1/3/0/8/130874493/zavobodewawezad.pdfIn PDF document text
    • http://rotoxil.sophialatrell.com/uploads/1/3/0/9/130969352/sajebinamukum.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/1/0430/7353/6149/files/duxivij.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/beloromawodosuxaso.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/9438/5575/files/gamatip.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1324/2014/files/simple_definition_of_electricity.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1959/9004/files/xigapesego.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6511/4775/files/40709834152.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/2726/5693/files/61345485618.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/69892687871.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0445/7473/6543/files/apache_hive_definitive_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/6588/5351/files/tipebukudapekemis.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4669/8146/files/agudas_llanas_y_esdrujulas_ejercicios.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8488/1825/files/witabirijakili.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/8432/5798/files/fanurigax.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_off000081fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x81FD 5184 bytes
SHA-256: eb94d32cf7fe19e7a67a45d529727a0eba622f034c0547994d19adfa3a902b2b
font_01_sfnt_off000093b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x93B7 10288 bytes
SHA-256: 7bc20eb2f41e7de49159461525d29b8b624256c592b33651a88dcfc6022b275a

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