Malicious PDF — malware analysis report

Static analysis result for SHA-256 2051c686d46f8f1e…

MALICIOUS

PDF

40.7 KB Created: 2020-08-09 20:43:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e64854b408dbdb27aed071bcbcd42b32 SHA-1: 2adb3c8c6d8dfa1330564bea9df77b4918ce6086 SHA-256: 2051c686d46f8f1ed0ace3c2b979b878ec6f63ceea9b4c02996c50ef680115d0
130 Risk Score

Malware Insights

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

The PDF file contains a mass of external links, many of which point to a link farm hosted on Shopify, designed to improve search engine rankings. One critical heuristic identified a link to a known malicious redirector, ttraff.ru, which is likely used to obscure the final malicious destination. The document body also contains a call-to-action phrase, reinforcing the lure to download something. No scripts were extracted from this sample.

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.
  • 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
  • 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.ru/pify?keyword=download+software+pdf+to+word+untuk+pc
    • http://zurowajo.vitriol3d.com/uploads/1/3/0/8/130814328/43b92586.pdf
    • http://files.sydneyruby.com/uploads/1/3/0/7/130739264/b21f78c03.pdf
    • http://files.thefilamentstudio.com/uploads/1/3/1/6/131606035/fakesijerisaz.pdf
    • https://cdn.shopify.com/s/files/1/0437/9744/6816/files/brain_tumor_detection_using_image_processing.pdf
    • https://cdn.shopify.com/s/files/1/0436/8865/7051/files/bopemupukusazajorod.pdf
    • https://cdn.shopify.com/s/files/1/0433/1801/8216/files/besub.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zizamazigunonafimav.pdf
    • https://cdn.shopify.com/s/files/1/0435/4460/8920/files/3850575199.pdf
    • https://cdn.shopify.com/s/files/1/0428/0716/5095/files/19635247753.pdf
    • https://cdn.shopify.com/s/files/1/0427/8976/5279/files/arterial_blood_gases_made_easy_download.pdf
    • https://cdn.shopify.com/s/files/1/0429/3951/5039/files/differentiation_of_algebraic_functions.pdf
    • https://cdn.shopify.com/s/files/1/0430/4614/2114/files/pubizepotolofapekaxeru.pdf
    • https://cdn.shopify.com/s/files/1/0435/1256/1819/files/kijarejireledela.pdf
    • https://cdn.shopify.com/s/files/1/0432/4828/7912/files/case_study_method_in_sociology.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_off00006118.bin
41888422d80dc974dd0be1358dc557ad06cb8ede3c5bea30c90a9482d4fe1c94
pdf-font-stream PDF embedded font (sfnt) at offset 0x6118 5304 bytes
font_01_sfnt_off00007354.bin
cd0e2e9f17da4c3ef74a4eb8540c86fc5518ef25912dc4362864b6804b7d6ffc
pdf-font-stream PDF embedded font (sfnt) at offset 0x7354 10168 bytes