Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0c063d709f7ce7c…

MALICIOUS

PDF

48.5 KB Created: 2020-10-15 06:13:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: fdf1c25276bcdd74bfcebf4d644566fd SHA-1: 1c1813080bbf43580de140ac337edcf1779765d8 SHA-256: c0c063d709f7ce7c2fdef53691b35bbf32e44b0ce57361cdcee5fb719729196f
154 Risk Score

Malware Insights

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

The PDF contains numerous links, with a critical heuristic identifying it as a redirector link to malicious infrastructure. The document body, though heavily obfuscated, contains URLs that appear to be part of a link farm designed to improve search engine ranking for specific keywords. The ML classifier also strongly indicated maliciousness. The primary attack pattern involves luring the user to click on these links, likely leading to a second-stage download or exploit.

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://cctraff.ru/strik?keyword=gre+math+syllabus+2020+pdf In PDF document text
    • https://site-1036932.mozfiles.com/files/1036932/molunodufen.pdfIn PDF document text
    • https://site-1042016.mozfiles.com/files/1042016/xatejafeza.pdfIn PDF document text
    • https://site-1042780.mozfiles.com/files/1042780/66670033083.pdfIn PDF document text
    • https://site-1040223.mozfiles.com/files/1040223/48676936513.pdfIn PDF document text
    • https://fuparududewon.weebly.com/uploads/1/3/1/8/131856041/0c082e.pdfIn PDF document text
    • https://redunexodozik.weebly.com/uploads/1/3/0/8/130814050/94106441c.pdfIn PDF document text
    • https://rewemekekebaz.weebly.com/uploads/1/3/1/4/131406535/sazebekijepesev-vobat-zewujon.pdfIn PDF document text
    • https://vozutadisifik.weebly.com/uploads/1/3/1/4/131483249/662261.pdfIn PDF document text
    • https://rivisoni.weebly.com/uploads/1/3/0/7/130739016/4671102.pdfIn PDF document text
    • https://zimiduninu.weebly.com/uploads/1/3/1/6/131637103/cafd84665a2f48.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/1/0437/6815/2216/files/letter_to_santa_template_black_and_white.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/0299/2536/files/hastens_mattress_price_india.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0488/2278/0069/files/the_arreat_summit_set_items.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0491/8168/7974/files/oxidation_state_of_oxygen_in_peroxide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/5759/7595/files/the_final_adventures_of_sherlock_holmes.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/9944/5664/files/dixorigexudinewiratofa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9359/0170/files/onmyoji_summon_circle_february_2019.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/6120/5924/files/votujudofazafav.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0476/7937/3478/files/443-444_math_worksheets.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/0741/7757/files/yoruba_to_english.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/1229/1264/files/37457571164.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0490/0651/0247/files/53345896558.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_off00007c9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7C9D 5828 bytes
SHA-256: 72ddc1d64d68fa45c06f0fd307b393c835fbe5521036f67675f5249f06fff5ce
font_01_sfnt_off0000904e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x904E 10656 bytes
SHA-256: 5c0b7ebb38472d14c203c87af240deeba1b0cb122db570122370ec4003cb90b9

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