Malicious PDF — malware analysis report

Static analysis result for SHA-256 dca1e6f35cf35679…

MALICIOUS

PDF

39.4 KB Created: 2020-09-02 00:38:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d2ced80141e8d045b62e7d4fe28f200e SHA-1: f400142548c04694da0a3e96c2020d9ac10dcd6e SHA-256: dca1e6f35cf35679c16f9ac2c97e7ed5f36d6be4498b77a90fb52a6ec08a1329
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The ML classifier also flagged this PDF with high confidence. The document body text is largely garbled but contains the URL https://ttraff.ru/wix?keyword=bird+sounds++free, which is flagged as a malicious redirector. The presence of numerous links suggests an attempt to lure users to external, potentially malicious, sites.

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.ru/wix?keyword=bird+sounds++free
    • https://cdn.shopify.com/s/files/1/0430/4424/1562/files/model_canvas_bisnis.pdf
    • https://cdn.shopify.com/s/files/1/0435/5116/2523/files/96268813010.pdf
    • https://cdn.shopify.com/s/files/1/0434/8038/3653/files/40271680192.pdf
    • https://static.usrfiles.com/ugd/dfb5f8_d5717a09bf72452988481b63ae65ab25.pdf
    • https://static.usrfiles.com/ugd/5926b4_41ee2bb9f5a94cd9a5f79e854840758c.pdf
    • https://static.usrfiles.com/ugd/73f3b0_a7b416c19f5b45dcaa2b5ce63a0f372e.pdf
    • https://static.usrfiles.com/ugd/8a419d_4479b77ad9284cacac398c43b6f65125.pdf
    • https://cdn.shopify.com/s/files/1/0437/9472/7074/files/sakipi.pdf
    • https://cdn.shopify.com/s/files/1/0440/1407/6069/files/scholar_who_walks_the_night_ost.pdf
    • https://cdn.shopify.com/s/files/1/0434/0973/5845/files/noroxuzeregamutofapoz.pdf
    • https://cdn.shopify.com/s/files/1/0433/9387/6118/files/vafiwifododurigon.pdf
    • https://cdn.shopify.com/s/files/1/0431/5440/7580/files/salesforce_sales_process.pdf
    • https://cdn.shopify.com/s/files/1/0432/6031/3768/files/wenilowemejexodaxazo.pdf
    • https://cdn.shopify.com/s/files/1/0437/1133/2503/files/o_que__degradao_ambiental.pdf
    • https://cdn.shopify.com/s/files/1/0435/5594/6655/files/maxevesimoxufewujutoxe.pdf
    • https://cdn.shopify.com/s/files/1/0434/7969/5517/files/biomaterials_science_free_download.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_off00004fad.bin
5349b9b8b51829a53b873abf1faf77c7ead92498b23293e435d389412926109f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4FAD 4512 bytes
font_01_sfnt_off00005f04.bin
41abdae4d2554d6e6ef6434cf32309cf3c15c9b1a3788e2066e3ea5ca4add4b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F04 10644 bytes
font_02_sfnt_off000082df.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x82DF 4324 bytes

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