Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcf6ab6aa4bde1bd…

MALICIOUS

PDF

49.1 KB Created: 2020-08-25 23:16:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2f4bf0472a13ebbd7ed9b186af4db244 SHA-1: 0f41acfd41577f76f2219070ccbcf32c74a49d8c SHA-256: dcf6ab6aa4bde1bda7d67eedc6d05685a625a3cdb4076b24fe7c33aeb07d6bba
152 Risk Score

Malware Insights

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

The PDF contains a prominent link, "Libros gratis para kindle", which is a lure for free Kindle books. This link redirects to `https://ttraff.com/pify?keyword=libros+gratis+para+kindle`, identified as a malicious redirector. The document also hosts a large number of external PDF links, many pointing to Shopify domains, suggesting a link farm or redirection strategy. The ML classifier strongly flagged this PDF as malicious.

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.com/pify?keyword=libros+gratis+para+kindle
    • http://files.pipscrunch.com.au/uploads/1/3/1/3/131384635/a80b287fba.pdf
    • http://files.goodchoicedogtraining.net/uploads/1/3/1/6/131606492/sanewoziwutexu_nimitakinadix_jidamozope_gulatazu.pdf
    • http://zezewilu.eracognita.com/uploads/1/3/1/3/131398367/sidelapoloxopep_bajojolalinit_durowaxamiwaf.pdf
    • https://cdn.shopify.com/s/files/1/0429/8843/7655/files/xumavakorodofede.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/sigejorivuzogekos.pdf
    • https://cdn.shopify.com/s/files/1/0432/3996/4834/files/hplc_method_validation.pdf
    • https://cdn.shopify.com/s/files/1/0437/1759/1189/files/toxicity_testing.pdf
    • https://cdn.shopify.com/s/files/1/0432/0965/4434/files/dabagusi.pdf
    • https://cdn.shopify.com/s/files/1/0429/8942/0695/files/solid_state_nmr_spectroscopy_principles_and_applications.pdf
    • https://cdn.shopify.com/s/files/1/0439/4090/5128/files/ada_espaol.pdf
    • https://cdn.shopify.com/s/files/1/0430/4021/1097/files/gallstones_treatment.pdf
    • https://cdn.shopify.com/s/files/1/0449/9865/6158/files/generos_literarios_de_la_edad_media.pdf
    • https://cdn.shopify.com/s/files/1/0432/6260/7520/files/bajiwemaw.pdf
    • https://cdn.shopify.com/s/files/1/0428/6421/4182/files/kuvilanewajadunuwa.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_off000071d1.bin
aebcb746712a8c0664329a5a7d909bb859655fb1f6a84faad202ec1c90e66942		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71D1 5060 bytes
font_01_sfnt_off00008309.bin
d0b37f2f1deef3eaa9b23474ee6716d7ee6c532fef0d652306765a95b263c2da		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8309 11380 bytes
font_02_sfnt_off0000a80c.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA80C 4324 bytes

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