Malicious PDF — malware analysis report

Static analysis result for SHA-256 243557f3c4e60348…

MALICIOUS

PDF

41.6 KB Created: 2020-08-22 01:55:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 51c8bf694ef9954310d31b91e70e3e51 SHA-1: d4f749c2dbf462c8faeafaebde5104d31c1b73a7 SHA-256: 243557f3c4e60348dedbc217183f2f019f7917a49e1cddc7cbe0997791cfd002
120 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, many of which point to domains associated with link farms and redirectors. The primary malicious URL identified is https://ttraff.com/pify?keyword=answering+teacher+interview+questions+correctly, which is a known malicious redirector. The document body, though heavily obfuscated, contains this URL and other links to external PDFs, suggesting a lure to a malicious site.

Heuristics 3

  • 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.
  • 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=answering+teacher+interview+questions+correctly
    • http://zoloti.rcherringtondesign.com/uploads/1/3/1/4/131453645/kanikib_suduguzivowus_gowegenuxitideb_mimumabepok.pdf
    • http://setagoto.frederickpediatrics.com/uploads/1/3/0/8/130874566/dafizigetituwuza.pdf
    • http://files.swiss-german-online.com/uploads/1/3/0/8/130874489/75ff69bc.pdf
    • http://files.jacobsarmoury.com/uploads/1/3/1/4/131483488/1641319.pdf
    • https://cdn.shopify.com/s/files/1/0431/5247/4267/files/kujojoreromutap.pdf
    • https://cdn.shopify.com/s/files/1/0447/8458/2813/files/glencoe_algebra_1_standardized_test_practice_answers.pdf
    • https://cdn.shopify.com/s/files/1/0434/3591/7473/files/alcohol_120_full_crack.pdf
    • https://cdn.shopify.com/s/files/1/0462/3033/9735/files/nekunesa.pdf
    • https://cdn.shopify.com/s/files/1/0428/4681/4374/files/php_phone_number_validation_for_us.pdf
    • https://cdn.shopify.com/s/files/1/0428/6713/0534/files/sapulobitexodowame.pdf
    • https://cdn.shopify.com/s/files/1/0432/3147/7922/files/hold_me_tight_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0436/2852/7776/files/82361398487.pdf
    • https://cdn.shopify.com/s/files/1/0431/1256/2849/files/doripot.pdf
    • https://cdn.shopify.com/s/files/1/0447/0757/8009/files/mastering_physics_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/0848/2724/files/guide_to_real_estate_investing.pdf
    • https://cdn.shopify.com/s/files/1/0431/0096/2977/files/34688186064.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_off000064f1.bin
4ab42af23c95f0fb2a95212c2e73f6835142d43c15692eede8098828ec63702a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64F1 5428 bytes
font_01_sfnt_off00007776.bin
6bf334ebd62089811dfbaa475515c0fb2fe033b928c41e57b9359a4ae10fc7f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7776 9944 bytes

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