Malicious PDF — malware analysis report

Static analysis result for SHA-256 796adc3cff1ec10d…

MALICIOUS

PDF

48.4 KB Created: 2020-09-11 20:10:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 744c9339f1dd4a3beb78f06994c707ef SHA-1: dad59109f771eef654785a56ec4776625f3f44cb SHA-256: 796adc3cff1ec10dfd40acbb936e42e6d0193f5f5b3dc98b2c8f5d95ec0e89fd
162 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, disguised as a document about mangoes. The document body, though heavily obfuscated, contains the same lure text and the malicious URL. The presence of numerous other PDF links suggests a link farm or SEO poisoning attempt to drive traffic to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=mangoes+round+the+year+question+answers In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static.usrfiles.com/ugd/bf0735_b0257dff51d4409492da04ce820cb049.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/805d2a_74ffe5cbd27e431f8fa6c1118824f1fd.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/4cfbbd_561c8e7f5e2045a097af3508552c2b88.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8bbd7_fb75d45c90684e5c8ca76332c10d055d.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_e4506f7c46214facacc6fc0c8b826402.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/de60da_2c7a28bf7a574d4584cb5a0aa4a1bdcd.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/cc3ca9_d6909ea527fb4944b98312cc7795d26b.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/4292/0869/files/django_template_tutorial.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/6562/0118/files/vejafefufalifanax.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/837d34_e3b5c381c07147d196d0f932fcbead08.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/ecec20_d3756f0b7c7744e69262841b4237a36b.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/3de8a6_e4abc0dab46945d59c768f5b4327c6a9.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/89363e_8d2d9d6b6d404e1d900f54c2e569c3a1.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/145364_329fe29350ae4f30a2444fa3629f7590.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000783a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x783A 5380 bytes
SHA-256: aa547f660833c743b5323ab51c0a167a184e793338bda7f298dcb275a0e1ec94
font_01_sfnt_off00008a9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A9A 13104 bytes
SHA-256: 404457e67ad0414813c4ceb289747074d8dd1ea18f87a9b76411d2b4461a7e12

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