Malicious PDF — malware analysis report

Static analysis result for SHA-256 65206ae6bf57b175…

MALICIOUS

PDF

42.9 KB Created: 2020-09-01 19:40:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b22ada77d7218d1d4f2f42d7ef242123 SHA-1: fd692279682c5b2fa0142f7a68207c4cc4603ee5 SHA-256: 65206ae6bf57b175adc239c134c78edb08452d6f72dd87d05c22d6a25b8d6ff8
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a significant number of embedded URLs pointing to external PDF files, a technique often used for SEO link farms or to distribute further malicious content. One of the embedded URLs, 'https://ttraff.com/wix?keyword=3d+image+animation+software+free', is flagged as a known malicious redirector. The ML classifier also strongly indicated maliciousness.

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=3d+image+animation+software+free
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/22bf55_508f0587a488447987a896064b7f0eb0.pdf
    • https://static.usrfiles.com/ugd/3d0627_901a44fbcf0844ecb5e902c21a96838c.pdf
    • https://static.usrfiles.com/ugd/fdee49_db90a0d0a87444e0b4b373e6539333c8.pdf
    • https://static.usrfiles.com/ugd/930050_c84b9e50645a46ce8ab28ec0b1a308c6.pdf
    • https://static.usrfiles.com/ugd/33a2e4_261ef3d1e17840119b0ced19c960daa4.pdf
    • https://cdn.shopify.com/s/files/1/0428/8079/4780/files/feral_tiefling_5e.pdf
    • https://cdn.shopify.com/s/files/1/0434/5734/7746/files/jurnal_metabolisme_asam_amino.pdf
    • https://cdn.shopify.com/s/files/1/0437/8463/4530/files/jakolefuluge.pdf
    • https://cdn.shopify.com/s/files/1/0428/8679/1334/files/less_commands_cheat_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0466/7873/7061/files/defibelemorofoju.pdf
    • https://cdn.shopify.com/s/files/1/0431/4077/6093/files/xaguvulepebiporijaxu.pdf
    • https://cdn.shopify.com/s/files/1/0436/3298/4222/files/lepilenosevopetudonej.pdf
    • https://static.usrfiles.com/ugd/fafc38_f7ccb44f6c5a43bf884f20851e308d8a.pdf
    • https://static.usrfiles.com/ugd/b8c837_cc77888b63c54c609c48469be275e08c.pdf
    • https://static.usrfiles.com/ugd/b8c837_1505b55887c0471ea6653e924c00a7b1.pdf
    • https://static.usrfiles.com/ugd/b8c837_ddbe9f7b9f6d4273aa45a7eb0b4c2d32.pdf
    • https://static.usrfiles.com/ugd/96768c_f9fb85fb00054afa90d9be46f6927714.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_off000068bb.bin
7ddcb5d59d34f9fd69cd33eafc4fca19b64a6b0e84ede90b367d98878435abc9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68BB 5356 bytes
font_01_sfnt_off00007af0.bin
7d8cf885424a4134f12cef28ee0cc640fbb67d43598136fb1378da0ab91ed848		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7AF0 10420 bytes

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