Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ecc341d6352bdca…

MALICIOUS

PDF

42.1 KB Created: 2020-08-31 07:42:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c57e63041112f0065026b151a805cd8f SHA-1: 552ccadc03068e69a9279c7f7144f23795c817a3 SHA-256: 9ecc341d6352bdca01bd170ec92280ccb09849f5ce15aacbcd5ae271c6d4ed62
152 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and contains a critical heuristic indicating a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the URL https://ttraff.cc/wix?keyword=definitive+technology+cs+8080hd+review, which is also listed as a malicious redirector. The file also contains a mass external PDF link farm, with many links pointing to static.usrfiles.com, though these appear to be confirmed benign. The primary malicious indicator is the redirector link.

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=definitive+technology+cs+8080hd+review
    • https://static.usrfiles.com/ugd/0a0016_5c97674042884a0aab4f2c3f61b26719.pdf
    • https://static.usrfiles.com/ugd/b8c837_d8353d9a4b014656bbdf633219a8d520.pdf
    • https://static.usrfiles.com/ugd/158fb9_b11b4c68e418470b8b55be9af58d7d8e.pdf
    • https://static.usrfiles.com/ugd/40b9e6_51ab94c4940c466c8b9151660f629be3.pdf
    • https://static.usrfiles.com/ugd/b8c837_341c009ad4dc49fa968a60bcb5cf96e1.pdf
    • https://static.usrfiles.com/ugd/37428b_daedebba16d64ceba6b69790c1378364.pdf
    • https://static.usrfiles.com/ugd/b8c837_9103ccc0c81647c68040e4b2ae5c9f27.pdf
    • https://static.usrfiles.com/ugd/217d68_971465c3197442e38c35278c69e53b68.pdf
    • https://cdn.shopify.com/s/files/1/0431/1370/9725/files/ferusidajowitipa.pdf
    • https://cdn.shopify.com/s/files/1/0433/2588/2518/files/kiln_process_in_cement_plant.pdf
    • https://cdn.shopify.com/s/files/1/0433/8103/1064/files/45487762190.pdf
    • https://cdn.shopify.com/s/files/1/0431/3019/2039/files/nulego.pdf
    • https://cdn.shopify.com/s/files/1/0433/5868/3294/files/midawumazatodud.pdf
    • https://cdn.shopify.com/s/files/1/0440/4445/2005/files/northampton_ma_accuweather.pdf
    • https://cdn.shopify.com/s/files/1/0432/6077/2510/files/zekeripopadopur.pdf
    • https://cdn.shopify.com/s/files/1/0440/7279/6310/files/18261858869.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_off00006313.bin
2c7b204d2a60e9f5c3e918bdcef882c892fa33438f6c4b31e31165d0a07b6794		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6313 5660 bytes
font_01_sfnt_off00007673.bin
9bec15d752a95fbd8585b5df1269b074eef60d6d7d24da08d99c31cff29daa13		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7673 10476 bytes

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