Malicious PDF — malware analysis report

Static analysis result for SHA-256 f752f8e508a6a2aa…

MALICIOUS

PDF

42.4 KB Created: 2020-08-30 21:42:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d55a7e104d2a2af83fdd8e6d4092a30d SHA-1: a780495b51501ec2f02c85457e4d380b1ce12c17 SHA-256: f752f8e508a6a2aa51039ee3f01a4cf146d5cec2c85d79bdf286e88bc54bbec2
152 Risk Score

Malware Insights

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

The PDF was flagged as malicious by an ML classifier and contains a significant number of embedded links. One of these links, 'https://ttraff.cc/wix?keyword=etica+cristiana+ejemplos', points to a known malicious redirector. The document body itself is heavily obfuscated and contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create malicious PDFs. The presence of a link farm suggests an attempt to distribute malicious content or engage in SEO poisoning.

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/wix?keyword=etica+cristiana+ejemplos
    • https://cdn.shopify.com/s/files/1/0435/5974/7745/files/the_plagiarism_checker_free.pdf
    • https://cdn.shopify.com/s/files/1/0428/1512/7708/files/43062252842.pdf
    • https://cdn.shopify.com/s/files/1/0433/9774/2750/files/jimalenolulizezoberutile.pdf
    • https://cdn.shopify.com/s/files/1/0432/2285/9943/files/encyclopedia_general_science_book.pdf
    • https://cdn.shopify.com/s/files/1/0436/1807/4786/files/52074280962.pdf
    • https://static.usrfiles.com/ugd/b8c837_3e458ba7d42946a488207651bd778856.pdf
    • https://static.usrfiles.com/ugd/b8c837_69b21ff665ae4c409e69a998991bc73a.pdf
    • https://static.usrfiles.com/ugd/05900a_fd9a8ae04cbe41c4b3a4f29db59d9bd0.pdf
    • https://static.usrfiles.com/ugd/760101_39c14ac02f2d4e7385130048bd270b78.pdf
    • https://static.usrfiles.com/ugd/b8c837_27a1d5dae6d6492e9c161aa61f94b069.pdf
    • https://cdn.shopify.com/s/files/1/0435/4693/5447/files/xubufifegegiwinukapur.pdf
    • https://cdn.shopify.com/s/files/1/0432/6539/2804/files/parashar_bhagwat_katha_video.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/1204107997.pdf
    • https://cdn.shopify.com/s/files/1/0464/6735/0680/files/jobate.pdf
    • https://cdn.shopify.com/s/files/1/0431/2802/9345/files/27544756557.pdf
    • https://cdn.shopify.com/s/files/1/0447/5171/6503/files/aida_model_in_marketing_communication.pdf
    • https://cdn.shopify.com/s/files/1/0434/0016/7589/files/xavemadadelidepukovivib.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/woburorofinuxup.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_off000065f1.bin
8c3bdb3a3d25fe059bc0cef3e35a4f91b75af2875b9c9537e822d16fe30383f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65F1 5112 bytes
font_01_sfnt_off0000773f.bin
d9d0d7203a7f4a1ece8c83b5bbccc793ba43fd89300efe8b1e3bed400e16c933		 pdf-font-stream PDF embedded font (sfnt) at offset 0x773F 11236 bytes

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