Malicious PDF — malware analysis report

Static analysis result for SHA-256 1083c9e870c02f8f…

MALICIOUS

PDF

40.8 KB Created: 2020-08-30 21:24:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a25844b8e09ede7bd8caa8f0e93a0296 SHA-1: 8334346e22b0c63fd631195757432ec0518c3504 SHA-256: 1083c9e870c02f8f69455a7ee480bb304dc81c457afbd36882fb1bbe08ba0d39
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/wix?keyword=importancia+del+estudio+de+la+historia'. This indicates the document is likely a lure to redirect users to a malicious site. The presence of numerous other PDF links, some benign and some potentially malicious, further supports this. No scripts were extracted, but the embedded URL is the primary indicator of malicious intent.

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=importancia+del+estudio+de+la+historia
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/3671/2861/files/puwipujufaselebabav.pdf
    • https://cdn.shopify.com/s/files/1/0432/8852/7013/files/standard_kitchen_cabinet_sizes_in_mm.pdf
    • https://cdn.shopify.com/s/files/1/0432/5366/1858/files/xhamster_video_downloader.pdf
    • https://cdn.shopify.com/s/files/1/0430/3749/1354/files/xozamib.pdf
    • https://static.usrfiles.com/ugd/b8c837_ddcf71396a3c463a99180d85e72960ff.pdf
    • https://static.usrfiles.com/ugd/764aaa_845ed93a35ec4115a8d599fbd29d4108.pdf
    • https://static.usrfiles.com/ugd/80c1db_41f6cdcf52da41cd9c4c371ed35464ab.pdf
    • https://static.usrfiles.com/ugd/8d0191_f9315c7ed35b4fda8e932e8bae34875c.pdf
    • https://cdn.shopify.com/s/files/1/0429/3532/0742/files/kung_fu_nes_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/3556/5990/files/sazosidaxakomilipafe.pdf
    • https://static.usrfiles.com/ugd/cac9e4_86ad2fcbd2cc4eada43de80480178838.pdf
    • https://static.usrfiles.com/ugd/b8c837_e125ae4e91294d01ae199ca72fba06ab.pdf
    • https://static.usrfiles.com/ugd/83b1b3_64e82d435ece4c6b84c3d78b260245e0.pdf
    • https://static.usrfiles.com/ugd/b8c837_d7e4032911c447a1b1c289acb84cc05b.pdf
    • https://static.usrfiles.com/ugd/1decf9_c11621a24456481fabcc19c7a0615f57.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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005eff.bin
4d70b34203d80456bedd166f8aa236e6ffa6221bb70fa9189124f93c34aae7f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5EFF 5248 bytes
font_01_sfnt_off00007094.bin
d73e86a99ff0db57771fced0d1d0fc96dcf7dbf102f964468b66f22b655707ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7094 11300 bytes

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