Malicious PDF — malware analysis report

Static analysis result for SHA-256 d12cc76298f6964a…

MALICIOUS

PDF

41.6 KB Created: 2020-08-08 00:41:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c64f936bac5d94635970c5d4ea63cccd SHA-1: bb460594f638e00c740ebf3b272f675843adf060 SHA-256: d12cc76298f6964a80b98ee6329a9ec1d4b93934c61d4ed45f15713d787dcb42
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains numerous embedded links, with a critical heuristic identifying a malicious redirector link to 'ttraff.cc'. The document body, though heavily obfuscated, contains text related to 'que es la caseina pdf' and references to wkhtmltopdf, suggesting a lure. The presence of many external PDF links, including one to a Shopify domain, indicates a link farm or redirection strategy. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to redirect users to harmful 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=que+es+la+caseina+pdf
    • http://files.splashpaintingandwine.com/uploads/1/3/0/8/130813550/xazogosok.pdf
    • http://files.sowilocommunityhigh.org/uploads/1/3/2/7/132740275/xoder-bodap-wunuvaw.pdf
    • http://juxaxo.katemcnulty.org/uploads/1/3/1/8/131858685/79772024b0.pdf
    • https://cdn.shopify.com/s/files/1/0434/0298/5621/files/mathematical_physics_by_gupta.pdf
    • https://cdn.shopify.com/s/files/1/0430/4479/8613/files/tuwadutir.pdf
    • https://cdn.shopify.com/s/files/1/0440/2397/2005/files/anemia_microcitica_hipocromica_en_el_adulto.pdf
    • https://cdn.shopify.com/s/files/1/0428/7997/5591/files/doki_doki_literature_club_poems.pdf
    • https://cdn.shopify.com/s/files/1/0431/3631/9639/files/jquery_remove_data_attribute.pdf
    • https://cdn.shopify.com/s/files/1/0430/8451/3444/files/vifaradajupixuvixasosofav.pdf
    • https://cdn.shopify.com/s/files/1/0434/6360/6429/files/lapebogeteg.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/ruwisosipopiwusanitilowaz.pdf
    • https://cdn.shopify.com/s/files/1/0437/0055/1845/files/e_coli_2020.pdf
    • https://cdn.shopify.com/s/files/1/0428/9875/1641/files/zolokuliwasu.pdf
    • https://cdn.shopify.com/s/files/1/0438/0386/9346/files/cytology_book_download.pdf
    • https://cdn.shopify.com/s/files/1/0437/4354/3450/files/muzijimosinutubedaladum.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_off0000635c.bin
2e4be9aa0d50550df0dfc60ff82c60fe0e598284d5ef331a6c50cd98c13ffd6f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x635C 5112 bytes
font_01_sfnt_off000074d5.bin
bcf6578c0588184e566925ea952d8d408451436f4ea80b01e73149191fe2fc30		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74D5 10876 bytes

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