Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fc90e476cbca102…

MALICIOUS

PDF

42.4 KB Created: 2020-11-02 12:03:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: e38b757b8d8b5a28323837cd78bcd943 SHA-1: 9231b38c861daf3afd893a67adbcf7cc27679688 SHA-256: 8fc90e476cbca102bc7db16a7ef63f25900f162e58052778e51c29bbd9499720
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of embedded links, many of which point to suspicious or unknown domains, suggesting a link farm or redirection scheme. One critical heuristic identified a link to known malicious redirector infrastructure. The document body, though obfuscated, contains the URL https://cctraff.ru/123?keyword=types+of+catapults+in+medieval+times, which is also flagged as malicious.

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/123?keyword=types+of+catapults+in+medieval+times In PDF document text
    • https://moxoviwepikiwu.weebly.com/uploads/1/3/2/8/132814726/5e28c27b554096.pdfIn PDF document text
    • https://dofazodasi.weebly.com/uploads/1/3/0/8/130873943/6479d1c99966e5.pdfIn PDF document text
    • https://besogedawifajop.weebly.com/uploads/1/3/4/2/134234635/kofoxabifo.pdfIn PDF document text
    • https://xujaxivef.weebly.com/uploads/1/3/1/4/131438557/8431065.pdfIn PDF document text
    • https://pigogokeda.weebly.com/uploads/1/3/1/8/131857695/jizogirigodajaxujuw.pdfIn PDF document text
    • https://fozijiruzixusap.weebly.com/uploads/1/3/4/3/134317533/zusixukojatodovo.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/1/0484/1875/0616/files/33749120358.pdfIn PDF document text
    • https://s3.amazonaws.com/tarajix/rediligipi.pdfIn PDF document text
    • https://s3.amazonaws.com/divelikubapiwaj/biology_chapter_8_review_answer_key.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/1868/2007/files/savovobojogepoma.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/0131/9061/files/pered.pdfIn PDF document text
    • https://s3.amazonaws.com/gavexilatuvitaz/hampton_cruiser_womens_bike.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/8400/8603/files/73906038964.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/8429/0484/files/16641647754.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_off000068bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x68BC 5316 bytes
SHA-256: f367f76bafa52c6dbc786d6ed7ef206c60ff49c0ba6db2173795bd2b8a8919af
font_01_sfnt_off00007ad5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7AD5 9968 bytes
SHA-256: 743ba4238ced4e670e624fb65cfee56b876615a53facae805ad7e68328382832

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