Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae9b44b8325288ca…

MALICIOUS

PDF

47.1 KB Created: 2020-08-31 02:52:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 16adc9915a374577b0dad2bddcfcd498 SHA-1: 8deb9033d6b25bc0b21012a3131ca9664882d74e SHA-256: ae9b44b8325288ca84be12d261330bb15304cf4b27629cdaf6453b433cb8107e
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing indicating a malicious redirector link, specifically pointing to 'ttraff.com' with a query for 'download manycam 4.1'. This suggests a social engineering lure to trick users into downloading software. The document body, though heavily obfuscated, also contains the URL 'https://ttraff.com/wix?keyword=download+manycam+4.1', reinforcing the malicious intent. The presence of numerous other PDF links, many pointing to 'static.usrfiles.com', indicates a link farm strategy, likely to obscure the primary malicious destination.

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=download+manycam+4.1
    • https://static.usrfiles.com/ugd/7c30af_5a19b7bbec8b4b1ca74bd020f0e0a3c1.pdf
    • https://static.usrfiles.com/ugd/b8c837_66628c131d9b48abb03ec98d06b2095a.pdf
    • https://static.usrfiles.com/ugd/6f58fb_5abcc0bc304640218c604a92ee197e65.pdf
    • https://static.usrfiles.com/ugd/b98abb_c6996ae6a766496dbb97c87d48dac519.pdf
    • https://static.usrfiles.com/ugd/82e28d_51f0b21677814f2ba0fb4f064780dc1c.pdf
    • https://static.usrfiles.com/ugd/36f25b_44d725fb71144d5abc0efe277472b51d.pdf
    • https://cdn.shopify.com/s/files/1/0432/2122/1539/files/occupational_therapy_and_neurological_conditions.pdf
    • https://cdn.shopify.com/s/files/1/0437/8787/8549/files/gerejax.pdf
    • https://cdn.shopify.com/s/files/1/0433/7745/9363/files/57593783495.pdf
    • https://cdn.shopify.com/s/files/1/0431/3874/4476/files/76272778921.pdf
    • https://static.usrfiles.com/ugd/b8c837_d4e60a866d5641c7a107ae86a43722e5.pdf
    • https://static.usrfiles.com/ugd/b8c837_853327562298494eaa99db4a50b10a37.pdf
    • https://static.usrfiles.com/ugd/0c268c_53439667742c46e09b9349d1d4649567.pdf
    • https://static.usrfiles.com/ugd/b8c837_0d0110ccc70e491da8c19d887a9b0a4b.pdf
    • https://static.usrfiles.com/ugd/576447_761fff3d4e3f48f7b243f105dd22aa23.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/
    • https://cdn.shopify.com/s/files/1/0432/2122/1539/files/occupatio

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000070f6.bin
2886e4b462b481a5e1e4a482b33d74dccbb501eccc6951bc858f16d84a43ac24		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70F6 4716 bytes
font_01_sfnt_off00008101.bin
dc7235e76b6b4dc89619a6710cdb5ee77262ca5ea57d13b11ef21356071d286c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8101 9524 bytes
font_02_sfnt_off0000a15e.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA15E 4324 bytes

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