Malicious PDF — malware analysis report

Static analysis result for SHA-256 69947d749d0d2b46…

MALICIOUS

PDF

48.4 KB Created: 2020-08-30 14:21:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8b112c13facb7b2e759bee7e6f45325f SHA-1: 11406221f8b1921886e5541c6841d9bea5ab8fed SHA-256: 69947d749d0d2b469012ed43a305d16054b3dcf627ee5de4389360014fe7d55f
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 a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the URL 'https://ttraff.com/wix?keyword=fl+studio+utorrent', suggesting a lure related to popular software. The presence of many external PDF links, some benign and some potentially malicious, indicates a link farm strategy. The ML classifier strongly flagged this PDF 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://ttraff.com/wix?keyword=fl+studio+utorrent
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_4af4ba60d53a4413bc00bf74e439031a.pdf
    • https://static.usrfiles.com/ugd/5a1791_93375f3738ed43cabac2f012770adff6.pdf
    • https://static.usrfiles.com/ugd/af0aa9_34a08e6d250846448f0a6db8c7fe26eb.pdf
    • https://static.usrfiles.com/ugd/162fe6_c001f430ab9641d4ace93edc01860f60.pdf
    • https://static.usrfiles.com/ugd/63022f_6daaf8245fcf4e1ea5ba628440deaec7.pdf
    • https://static.usrfiles.com/ugd/b8c837_8e75c4aab1e141478626a75534c551cd.pdf
    • https://static.usrfiles.com/ugd/71fd01_cc396b8e82e94d4eaa1deaabcb87de3d.pdf
    • https://static.usrfiles.com/ugd/45fd81_d1f865377bfe4d8d97dea25b9137819c.pdf
    • https://static.usrfiles.com/ugd/63d3ad_4d104a4e8b73494da2f53fa7b2d165c3.pdf
    • https://cdn.shopify.com/s/files/1/0439/7131/3822/files/12574942154.pdf
    • https://cdn.shopify.com/s/files/1/0431/9045/2385/files/microcytic_anemia_guidelines.pdf
    • https://cdn.shopify.com/s/files/1/0436/3255/8240/files/11662961150.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/96056065099.pdf
    • https://cdn.shopify.com/s/files/1/0433/3781/0075/files/83705642857.pdf
    • https://static.usrfiles.com/ugd/80c1db_8f3b45ebcd1e4519b52f9d774fe0d314.pdf
    • https://static.usrfiles.com/ugd/b8c837_c6c43a1de9d949f5ad10a1b366588b14.pdf
    • https://static.usrfiles.com/ugd/b8c837_d8e06fc5fe7142e8833420b4b276a4ec.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/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00009926.bin
6ec7b6f2b0fc1ba7d91fb63d91f4caf03925bb0e495003f7d604444ad84c122f		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x9926 18192 bytes
font_00_sfnt_off00006237.bin
1c5838db67b64a6f589c265598c220db0b9f876900796ba83e66c41f86f94e45		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6237 4564 bytes
font_01_sfnt_off000071c2.bin
c9b8709ab83113adc6094cd8f96bee32d60ba269694340b38312ecd4e743e668		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71C2 12224 bytes

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