Malicious PDF — malware analysis report

Static analysis result for SHA-256 81732771d9808b40…

MALICIOUS

PDF

34.3 KB Created: 2020-09-10 10:22:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 40a845b4dc260d260c906b84ac97ce51 SHA-1: ec95bf56f4cb046660da87f255f13ff2dd1adb20 SHA-256: 81732771d9808b4015c203c57bebc5b393f9aa784872c8e5f94c4dbc3e1d1041
120 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.me/wix?keyword=google+assistant+apk++for+android'. This URL is presented in a way that suggests it is a search result, aiming to trick users into clicking it. The document body, though heavily corrupted, contains the same search query and URL, reinforcing the lure. The presence of a large number of embedded links, many pointing to static.usrfiles.com, suggests a link farm or SEO poisoning tactic to improve search engine ranking for malicious content.

Heuristics 3

  • 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.
  • 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.me/wix?keyword=google+assistant+apk++for+android
    • https://static.usrfiles.com/ugd/516574_57ae01fcd0be4817ab435772b2d0df1b.pdf
    • https://static.usrfiles.com/ugd/f55bec_29934ae900c14a0cbbae100d1ecba68b.pdf
    • https://static.usrfiles.com/ugd/b8c837_620011206012453e89e1da7d9a111f2b.pdf
    • https://cdn.shopify.com/s/files/1/0435/8399/6063/files/cambridge_complete_pet.pdf
    • https://cdn.shopify.com/s/files/1/0429/2732/5351/files/macleans_university_guidebook_2018.pdf
    • https://static.usrfiles.com/ugd/1a89c8_35b0324a21ae4ea09dd883bfacef3a0a.pdf
    • https://static.usrfiles.com/ugd/0dd040_61bf0405404e484089b608cdf21b3602.pdf
    • https://static.usrfiles.com/ugd/0bfb20_1e08d5c015094ba78759cf31014fdf82.pdf
    • https://static.usrfiles.com/ugd/685707_1cb0c5e1f92e4bdabe2d22739105046d.pdf
    • https://static.usrfiles.com/ugd/3de8a6_ce7904ea79724c5ca3b8873f98569914.pdf
    • https://static.usrfiles.com/ugd/ce77c6_c6cf350b7ae5485b96ddd2f47fd003d0.pdf
    • https://static.usrfiles.com/ugd/8ab72e_659f181a01bc4df89c93b4a1269c750d.pdf
    • https://static.usrfiles.com/ugd/3bca44_192ec89aa5de4a64a86fccd517d11c3e.pdf
    • https://static.usrfiles.com/ugd/e8e253_1f026dee35224722a87ec7e20b494585.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_off00004954.bin
c1a89393ac5648db5bc08d8c22fc203141ce2e54290fbab8d2bffa1affc2fcb8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4954 5304 bytes
font_01_sfnt_off00005b76.bin
e67d174ef56d934c91037f22e807b3d12d90269797e49efac76b8e5ecafca67e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B76 9592 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.