Malicious PDF — malware analysis report

Static analysis result for SHA-256 72e72c5782695ef8…

MALICIOUS

PDF

65.3 KB Created: 2020-08-29 17:10:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7dac28da4304af72dc54d485422abd36 SHA-1: 31019e19ebb9383454671e494750ed097aae713f SHA-256: 72e72c5782695ef84735f46db1fdabf5212d24caaa05e6dd2805ceead3a278f4
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains embedded URLs, one of which, 'https://ttraff.cc/wix?keyword=cold+chamber+die+casting+process+pdf', is flagged as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting an attempt to direct the user to malicious infrastructure. The presence of numerous other PDF links, many pointing to benign content, indicates a potential link farm or SEO manipulation tactic to disguise the malicious intent. The ML classifier also 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.cc/wix?keyword=cold+chamber+die+casting+process+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/ace02d_d1908e2e0c5a4220922ec2653ae62437.pdf
    • https://static.usrfiles.com/ugd/b8c837_7c8fe72c7cba4dc697efdf1342edbf87.pdf
    • https://static.usrfiles.com/ugd/b8c837_10c165ccca2648dea3ce9a573b0be4fb.pdf
    • https://static.usrfiles.com/ugd/b8c837_d074702f2914407e83cd0faa81140cae.pdf
    • https://static.usrfiles.com/ugd/b8c837_ffe5f4d356c04db99c343782e2aaf3dc.pdf
    • https://cdn.shopify.com/s/files/1/0432/1037/5325/files/rajemedobusifobafijabasu.pdf
    • https://cdn.shopify.com/s/files/1/0427/9622/0572/files/carpentry_workshop_practical.pdf
    • https://cdn.shopify.com/s/files/1/0437/8525/7112/files/how_to_download_friends_list_from_facebook.pdf
    • https://cdn.shopify.com/s/files/1/0433/5131/0488/files/aditya_hrudayam_malayalam.pdf
    • https://cdn.shopify.com/s/files/1/0434/3493/4429/files/76884463945.pdf
    • https://cdn.shopify.com/s/files/1/0428/9714/6019/files/55324962516.pdf
    • https://cdn.shopify.com/s/files/1/0431/8163/7794/files/radiramovoluxutumizuwet.pdf
    • https://cdn.shopify.com/s/files/1/0433/4590/3781/files/88692809014.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/23535065851.pdf
    • https://cdn.shopify.com/s/files/1/0428/3580/4319/files/practical_guide_to_insulin_therapy.pdf
    • https://static.usrfiles.com/ugd/b8c837_8e8dc1c3d41843349c66fd4d5ca0aa5b.pdf
    • https://static.usrfiles.com/ugd/b8c837_e92239d1f71f462a970f23ad998aaf7b.pdf
    • https://static.usrfiles.com/ugd/271e65_ae8ad2a3bcad4909b8e69f5246da583e.pdf
    • https://static.usrfiles.com/ugd/b8c837_f43f09a6b1c24dfd8492277394a58f33.pdf
    • https://static.usrfiles.com/ugd/b8c837_2ae2582386cf4e27979301d401409196.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b773.bin
7f184ad17885167f5a35b8d1fa148f69d60c1493ccf238cbf9fef37b3ef85015		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB773 5612 bytes
font_01_sfnt_off0000ca61.bin
822cfb3c08340226fb525b11e1607a7643711e26168ca219e05521ca9cacc327		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCA61 14724 bytes

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