Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e675854a4c9a994…

MALICIOUS

PDF

38.2 KB Created: 2020-08-30 04:38:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f42820aae7139e67f55ec6a1d2c42dbb SHA-1: ecffe71036fb617a26c48c247c1c183f4e488b3c SHA-256: 8e675854a4c9a9945103525b2b75b63db2fc65bc97a1ddc58f218dc4458a70ae
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/wix?keyword=ck9c+you+can%2527t+hide'. This indicates the document's primary purpose is to redirect users to a potentially harmful site. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, and the document body was heavily obfuscated, but the presence of the malicious URL is sufficient evidence for this assessment.

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.cc/wix?keyword=ck9c+you+can%2527t+hide
    • https://cdn.shopify.com/s/files/1/0435/1619/9066/files/94330551708.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/38804475130.pdf
    • https://cdn.shopify.com/s/files/1/0435/3510/6203/files/39089268739.pdf
    • https://cdn.shopify.com/s/files/1/0432/6142/7867/files/70450638744.pdf
    • https://cdn.shopify.com/s/files/1/0428/5169/6796/files/princeton_review_s_cracking_the_gre_mathematics_subject_test.pdf
    • https://cdn.shopify.com/s/files/1/0450/2195/4206/files/antrag_alg_2_formular.pdf
    • https://cdn.shopify.com/s/files/1/0433/0346/9221/files/16041668550.pdf
    • https://static.usrfiles.com/ugd/b8c837_9f28f964dfbd4c9dbd9f1f6acb0820fe.pdf
    • https://static.usrfiles.com/ugd/599026_dbdc6cfb3ad74278afe548c8e9b43c0a.pdf
    • https://static.usrfiles.com/ugd/b8c837_d8353d9a4b014656bbdf633219a8d520.pdf
    • https://static.usrfiles.com/ugd/b8c837_92275970b2c44c3b9fc997e76093d04d.pdf
    • https://static.usrfiles.com/ugd/b8c837_821b45cd8966440ba66dbcaf78623e81.pdf
    • https://static.usrfiles.com/ugd/87fdc7_f93381fb660d4862a866d8b67e15bddc.pdf
    • https://static.usrfiles.com/ugd/868401_b75ddefe0eba4099bb4f96bf3be64564.pdf
    • https://static.usrfiles.com/ugd/b8c837_f65864bab259482086ab617609879f25.pdf
    • https://static.usrfiles.com/ugd/b8c837_669c4aaa914c461bbb715d840308921f.pdf
    • https://static.usrfiles.com/ugd/158fb9_ad56317f5ea64cfaaecea2b5a336a763.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004af6.bin
b57a228eb5fe89907f41bcf5023201471d0329520618b68f2274922b7515e5c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4AF6 4980 bytes
font_01_sfnt_off00005bf6.bin
0a391615574b275b35eb623fb53c723bd6bda00fc2a86e57ec001ea0e87db4d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5BF6 9856 bytes
font_02_sfnt_off00007dbe.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7DBE 4324 bytes

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