Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c0a4cc4c155f647…

MALICIOUS

PDF

37.6 KB Created: 2020-09-01 01:17:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f558c2918f68dfd068213a0148341389 SHA-1: 7d75c812d7cb950592427d11d07c89556b140b59 SHA-256: 3c0a4cc4c155f647087a959f347f94ffc01ba41904f409af918792f3c8c68746
152 Risk Score

Malware Insights

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

The PDF contains embedded links, with one pointing to a known malicious redirector at 'https://ttraff.ru/wix?keyword=clickshare+cs-+100+setup+guide'. The document body, though heavily obfuscated, contains text suggesting it's a setup guide, which is a common lure for phishing or malware delivery. The presence of numerous other links to Shopify, including one to 'https://cdn.shopify.com/s/files/1/0436/2004/0866/files/3829671389.pdf', indicates a link farm strategy, likely to obscure the malicious redirector.

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://ttraff.ru/wix?keyword=clickshare+cs-+100+setup+guide
    • https://cdn.shopify.com/s/files/1/0436/2004/0866/files/3829671389.pdf
    • https://cdn.shopify.com/s/files/1/0430/3470/6069/files/barbie_tingz_mp4_video.pdf
    • https://cdn.shopify.com/s/files/1/0436/1817/3086/files/apache_tomcat_server_interview_questions_answers.pdf
    • https://cdn.shopify.com/s/files/1/0436/0775/2861/files/97977453837.pdf
    • https://cdn.shopify.com/s/files/1/0434/2474/3591/files/12721704312.pdf
    • https://cdn.shopify.com/s/files/1/0437/7791/7085/files/juan_tamariz_mnemonica_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/8746/2551/files/bijipumetugezifa.pdf
    • https://cdn.shopify.com/s/files/1/0431/0073/3596/files/dupupelamisebogixiz.pdf
    • https://cdn.shopify.com/s/files/1/0434/8700/2790/files/chaalbaaz_live_app.pdf
    • https://static.usrfiles.com/ugd/314c35_c8a7e8185e8e4f98a2f5c1e510fc5b47.pdf
    • https://static.usrfiles.com/ugd/08fe48_7cd6bf134cb948e5894e1d77990a703d.pdf
    • https://cdn.shopify.com/s/files/1/0466/7188/8549/files/69412326593.pdf
    • https://cdn.shopify.com/s/files/1/0435/9972/4702/files/7113723658.pdf
    • https://cdn.shopify.com/s/files/1/0430/2870/9539/files/bilulevepesijidimas.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_off00005427.bin
2e6bc12abd297337a9d8705a8db01c9b89c96b9fc740b8af6d01c230021f772d
pdf-font-stream PDF embedded font (sfnt) at offset 0x5427 5532 bytes
font_01_sfnt_off000066f3.bin
9358ab52898471ffb8e41f0c7ea0ae400d8ee885966d3a9d1f30e7c352a60f1c
pdf-font-stream PDF embedded font (sfnt) at offset 0x66F3 10256 bytes