Malicious PDF — malware analysis report

Static analysis result for SHA-256 583fa4f8cfe73643…

MALICIOUS

PDF

42.8 KB Created: 2020-09-03 07:55:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fac902f4e06feb6281734ce1049aafc1 SHA-1: f9c233a63874ae867e4880ce141712afa1e19057 SHA-256: 583fa4f8cfe73643997ec558ce5d155cdd39226a23a6230decee28d1f8fbdc51
152 Risk Score

Malware Insights

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

The PDF file was flagged as malicious due to a high number of embedded links, with one specifically pointing to a known malicious redirector. The document body contains text that appears to be a lure, 'Asagai i live the answer', and also includes the malicious URL. The heuristic PDF_SEO_LINK_FARM indicates a large number of external PDF links, suggesting a link farm designed to manipulate search engine results or distribute further malicious content. The ML classifier also strongly indicated maliciousness.

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.club/wix?keyword=asagai+i+live+the+answer
    • https://static.usrfiles.com/ugd/b8c837_41ac5ccd51e14f04a62e0b6039b684e1.pdf
    • https://static.usrfiles.com/ugd/b8c837_bd2509dd60c8478d80cab159c50a1e43.pdf
    • https://static.usrfiles.com/ugd/b444d4_11055af84de944f7a71bd014d3ae72d9.pdf
    • https://static.usrfiles.com/ugd/a421e3_2c2353a0fbb14627b354e9f3f23112d5.pdf
    • https://static.usrfiles.com/ugd/98e298_dafceb66d87341dd860aead53800b6a2.pdf
    • https://cdn.shopify.com/s/files/1/0464/7665/6790/files/scott_stamp_catalog_2018.pdf
    • https://cdn.shopify.com/s/files/1/0434/5564/3813/files/kipopo.pdf
    • https://cdn.shopify.com/s/files/1/0437/5894/4405/files/terapi_bronkopneumonia_pada_anak.pdf
    • https://cdn.shopify.com/s/files/1/0432/0726/2367/files/punejegenurodejo.pdf
    • https://static.usrfiles.com/ugd/9c0842_c2ae718755944026b8fdb8745f586104.pdf
    • https://static.usrfiles.com/ugd/b8c837_f5d37feffc15469badd09f3a45dd958d.pdf
    • https://static.usrfiles.com/ugd/455f95_0a0f94deb8304ccda1a802e8016e27b1.pdf
    • https://static.usrfiles.com/ugd/fd30ac_2ed3cccf687e4d2ab4cf4ea7c5bcda55.pdf
    • https://static.usrfiles.com/ugd/5bb01c_ea8b759d3c014e1faf1d30137e51fc27.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/26443777516.pdf
    • https://cdn.shopify.com/s/files/1/0434/2412/0984/files/segekexika.pdf
    • https://cdn.shopify.com/s/files/1/0437/0425/4615/files/zebezowugipowidusidij.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_off00006b54.bin
d19b61db759a8ada249b23f2470e4191738ec65c71589f6514a20fe7de45d277		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B54 5088 bytes
font_01_sfnt_off00007caf.bin
6dbac77fd15cb579ba2f7de9e6187db334aae5046d8d4aee4361531188f35d66		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CAF 9892 bytes

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