Malicious PDF — malware analysis report

Static analysis result for SHA-256 1791322a70e92f38…

MALICIOUS

PDF

47.6 KB Created: 2020-08-14 06:55:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 04494ae661edf05e412881175afccf89 SHA-1: a9de495453b7d9fe2ba476e9d384c08155f1c2e1 SHA-256: 1791322a70e92f380797df544968c2dcebce0154d74be5b5ca1e673dae340613
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

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.com/pify?keyword=video+blackpink+boombayah+live+mp4 In PDF document text
    • http://wifox.danhegstad.com/uploads/1/3/1/4/131407995/4056405.pdfIn PDF document text
    • http://files.clcem.net/uploads/1/3/1/8/131856624/somokova.pdfIn PDF document text
    • http://buvisex.pr-perfect.com/uploads/1/3/1/0/131071243/gitenafewezupovus.pdfIn PDF document text
    • http://files.nakayamaus.com/uploads/1/3/1/6/131606874/kidukigufove.pdfIn PDF document text
    • http://files.ninjagoats.org/uploads/1/3/1/3/131384208/wepinidudobopu_razudevavexibo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/8459/2805/files/yugioh_zexal_episodes.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0012/6885/files/mogewuzilomokef.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0441/2165/3400/files/23646277643.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0451/3693/7125/files/platelets_function_test.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/6559/7342/files/article_learning_english.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/2160/4763/files/voludetisopolakoxo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/51191810805.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0210/0899/files/hp_officejet_6700.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7007/0690/files/multivariate_statistical_methods_morrison.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/4763/2548/files/68790033549.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6858/8194/files/sugep.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/3366/4411/files/lejuwesubeva.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004b0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4B0C 3200 bytes
SHA-256: 1d6fe413d98bf3d1ee0153d6b247e156a2b943c928557b70874f99ef0b410c70
font_01_sfnt_off0000568c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x568C 5460 bytes
SHA-256: 929561131ea4453f1592590dc49dc8edd38f2fed06b4fdb092802254b4459369
font_02_sfnt_off00006903.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6903 12288 bytes
SHA-256: 7b4f3023a985a5dacbeb865bacb75a5a8d22d271872865092a9af0e7e3007591
font_03_sfnt_off000090c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x90C2 18776 bytes
SHA-256: e58e8e8d3617fa2f52d62469859eb662c26c1c1537dc21f5cc6f1aa71eaa6aed

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