Malicious PDF — malware analysis report

Static analysis result for SHA-256 51b243bbb7abb144…

MALICIOUS

PDF

43.7 KB Created: 2020-08-14 00:10:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1964fc8aa6281eb6393cf7d162002287 SHA-1: b02405df655f63dbe5caa00d15bb2e1aed45db92 SHA-256: 51b243bbb7abb144695a28348a258735023232e5f16cc61c860e0293e68c2cfd
152 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to a link farm hosted on cdn.shopify.com, and one critical link to a known malicious redirector at ttraff.cc. The ML classifier strongly indicated maliciousness. The document body, though heavily obfuscated, contains URLs that are also present in the heuristic findings, suggesting a lure to external 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/wb?keyword=android%20studio%20tutorial%20indonesia%20pdf
    • http://files.sports-journalism.com/uploads/1/3/2/7/132740253/ce2e3d5d71.pdf
    • http://walesarob.titullo.com/uploads/1/3/1/3/131398157/6550155.pdf
    • http://files.drhafezi.net/uploads/1/3/2/6/132695492/55847cca0.pdf
    • https://cdn.shopify.com/s/files/1/0434/2205/6600/files/94708781889.pdf
    • https://cdn.shopify.com/s/files/1/0430/7940/1632/files/zezisovekipudogavuxidi.pdf
    • https://cdn.shopify.com/s/files/1/0433/5838/8374/files/cancionero_catolico_2020.pdf
    • https://cdn.shopify.com/s/files/1/0429/7034/9731/files/34371028455.pdf
    • https://cdn.shopify.com/s/files/1/0432/4160/3239/files/iupac_nomenclature_of_simple_organic_and_inorganic_compounds.pdf
    • https://cdn.shopify.com/s/files/1/0428/0591/9903/files/23474898697.pdf
    • https://cdn.shopify.com/s/files/1/0438/4771/2928/files/siwuvexibezujez.pdf
    • https://cdn.shopify.com/s/files/1/0433/9925/0081/files/33202120752.pdf
    • https://cdn.shopify.com/s/files/1/0437/3381/1351/files/48679597888.pdf
    • https://cdn.shopify.com/s/files/1/0430/1648/7065/files/paxekulalamano.pdf
    • https://cdn.shopify.com/s/files/1/0437/5996/0218/files/55581130471.pdf
    • https://cdn.shopify.com/s/files/1/0433/5029/4678/files/zuniwimefivanavejasulugu.pdf
    • https://cdn.shopify.com/s/files/1/0434/3716/2646/files/19149239994.pdf
    • https://cdn.shopify.com/s/files/1/0428/2040/3356/files/58385894794.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/43692268827.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006df4.bin
ce3fc919f6795e69b98996555d4d0a01f48e832e88215bb374418128e1a6de0a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DF4 5024 bytes
font_01_sfnt_off00007f14.bin
0e42e59fdfbb9005e3d61074cbdfadc8df6c3ba36fe608549413a56b0bde5c19		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F14 10140 bytes

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