Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d5d74a415e75d3a…

MALICIOUS

PDF

50.4 KB Created: 2020-09-01 01:31:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1fea5656384977bdbf95d2ad314a7909 SHA-1: dc5f3766d6b5ca0fa1f4873c260073f8746c1ae7 SHA-256: 1d5d74a415e75d3a70a5555caa6bcbcd93ffc110936c14e9b4f85bbb45696a02
152 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by an ML classifier and contains a critical heuristic indicating it links to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the URL https://ttraff.cc/wix?keyword=calvatia+utriformis+wikipedia, which is the primary indicator of malicious intent. The file also exhibits characteristics of a link farm, with numerous embedded URLs pointing to various PDF files, suggesting a potential attempt to manipulate search engine results or distribute content through a network of linked documents.

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=calvatia+utriformis+wikipedia
    • https://static.usrfiles.com/ugd/cec570_c269c2450940474db3081c049eecfe95.pdf
    • https://static.usrfiles.com/ugd/b8c837_ee9db509fe3b41b8b98ae1688667e26e.pdf
    • https://static.usrfiles.com/ugd/96768c_e18336f9263e45a88a0ab9821beb1302.pdf
    • https://static.usrfiles.com/ugd/a1fb72_6a983891071d42278fcd1a2a0dc46235.pdf
    • https://cdn.shopify.com/s/files/1/0433/5645/5067/files/wupixilodizizinadu.pdf
    • https://cdn.shopify.com/s/files/1/0435/9297/4499/files/martin_j_pring_technical_analysis_explained.pdf
    • https://cdn.shopify.com/s/files/1/0428/3321/5654/files/fofesukopebiw.pdf
    • https://cdn.shopify.com/s/files/1/0434/8405/3669/files/balixukolisinivirozetifil.pdf
    • https://cdn.shopify.com/s/files/1/0428/9282/0643/files/kalagabuzopovemixudoge.pdf
    • https://cdn.shopify.com/s/files/1/0430/3598/4029/files/sokixafodojobozomibaw.pdf
    • https://cdn.shopify.com/s/files/1/0431/8543/8884/files/buffer_in_pharmaceutical_and_biological_system.pdf
    • https://cdn.shopify.com/s/files/1/0432/0601/7186/files/rexufiwogada.pdf
    • https://cdn.shopify.com/s/files/1/0429/1405/4300/files/protection_paladin_guide.pdf
    • https://cdn.shopify.com/s/files/1/0435/7944/1307/files/54209235032.pdf
    • https://cdn.shopify.com/s/files/1/0431/0663/1833/files/aetiology_of_diabetes_mellitus.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_off00008843.bin
e5410a1518b0438a2bac17cc486cda7fd7ec1fd5b6999a8955b8c5e743381705		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8843 5308 bytes
font_01_sfnt_off00009a53.bin
851f76bb8a8954585935da2b1752e16fc8afbd6f48e09341ef4ef57be5b2834e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9A53 10168 bytes

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