Malicious PDF — malware analysis report

Static analysis result for SHA-256 c28bddf3e3dc0a9d…

MALICIOUS

PDF

55.2 KB Created: 2020-08-27 19:42:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4eba73cd95afcc0f27196beb909940db SHA-1: 7d0ecb5f01186086f3ba32002e6905ebb1647c82 SHA-256: c28bddf3e3dc0a9d02b6b324b7a8920ac0baa4efac83bb484a82e964971d0afb
120 Risk Score

Malware Insights

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

The PDF was flagged for containing a malicious redirector link and a large number of external PDF links, suggesting a link farm or SEO manipulation tactic. The primary malicious URL identified is https://ttraff.ru/pify?keyword=sistemas+de+ecuaciones+lineales+ejercicios+resueltos. While no scripts were extracted, the sheer volume of links and the presence of a malicious redirector indicate a high likelihood of malicious intent, possibly to lead users to phishing sites or malware downloads.

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.ru/pify?keyword=sistemas+de+ecuaciones+lineales+ejercicios+resueltos
    • http://tevulo.tornadoshelter.com/uploads/1/3/1/6/131606490/vatiw_nazovixeli_dozij.pdf
    • http://xesif.soundstonelaw.com/uploads/1/3/1/4/131453574/tipakiv.pdf
    • http://files.drydesign.co.uk/uploads/1/3/1/8/131871433/5679692.pdf
    • https://cdn.shopify.com/s/files/1/0436/5733/0853/files/abcd_telugu_movie_songs_free.pdf
    • https://cdn.shopify.com/s/files/1/0433/7192/1571/files/5th_grade_math_word_problems_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0430/8477/5577/files/bokorafubibixuxovaziveniv.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/sitomomuwarusubewikujo.pdf
    • https://cdn.shopify.com/s/files/1/0432/9180/3801/files/85694368973.pdf
    • https://cdn.shopify.com/s/files/1/0433/1284/0872/files/77552184197.pdf
    • https://cdn.shopify.com/s/files/1/0429/6422/2101/files/what_is_the_square_root_of_35.pdf
    • https://cdn.shopify.com/s/files/1/0433/7162/6659/files/vikekupewusupejimov.pdf
    • https://cdn.shopify.com/s/files/1/0431/3631/9645/files/38105302912.pdf
    • https://cdn.shopify.com/s/files/1/0427/9874/3719/files/dropbox_paper_template_placeholder.pdf
    • https://cdn.shopify.com/s/files/1/0431/8226/0384/files/oceans_hillsong_guitar_chords.pdf
    • https://cdn.shopify.com/s/files/1/0437/6189/3534/files/bcom_law_unisa.pdf
    • https://cdn.shopify.com/s/files/1/0429/2739/0887/files/active_directory_windows_server_2012_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0444/4015/8374/files/74412175934.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_off000088e7.bin
4002b26c93443c4e68783b86b7ee48f49625a18fd966bf2d212457e8857ae7e8
pdf-font-stream PDF embedded font (sfnt) at offset 0x88E7 5264 bytes
font_01_sfnt_off00009aa7.bin
05006ba83c850db5a068938f4ff1c0a7126397ea5019062fef63474ae5f5600c
pdf-font-stream PDF embedded font (sfnt) at offset 0x9AA7 16776 bytes