Malicious PDF — malware analysis report

Static analysis result for SHA-256 98343e47fc5a330e…

MALICIOUS

PDF

42.2 KB Created: 2020-09-02 02:27:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e8aa1b0891f9f0b0ebf59491c94648cd SHA-1: 7ac5f9bdc8a6950841bdc5899ee2c218a069cac2 SHA-256: 98343e47fc5a330e5975907c535fcd1e7ed658128d357a536ac9fcad181b4e79
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains numerous links, with one critical heuristic identifying a link to a known malicious redirector infrastructure. The document body, though partially corrupted, contains the URL 'https://ttraff.cc/wix?keyword=betaflight++windows+10', suggesting a lure for users searching for software. The presence of a large number of external PDF links, many pointing to shopify.com, indicates a link farm strategy, likely to improve SEO for malicious content or to obscure the final destination. 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.cc/wix?keyword=betaflight++windows+10
    • https://cdn.shopify.com/s/files/1/0429/6422/2101/files/cheap_thrills_sia_songs.pdf
    • https://cdn.shopify.com/s/files/1/0432/4392/9757/files/source_code_review_document_template.pdf
    • https://cdn.shopify.com/s/files/1/0434/4853/3144/files/31547996573.pdf
    • https://cdn.shopify.com/s/files/1/0433/0822/0574/files/popukapuz.pdf
    • https://cdn.shopify.com/s/files/1/0432/0650/8701/files/12111016037.pdf
    • https://static.usrfiles.com/ugd/55f640_84c1116bdb0d424dabb7e97720e67e70.pdf
    • https://static.usrfiles.com/ugd/121e37_51d12d5fbc0849a5a71c1044993ea890.pdf
    • https://static.usrfiles.com/ugd/9ea9b6_fe31e0db08874065b173f674f91cf3c7.pdf
    • https://cdn.shopify.com/s/files/1/0430/8022/0826/files/adobe_flash_professional_cs6_crack.pdf
    • https://cdn.shopify.com/s/files/1/0434/0049/5260/files/56522951662.pdf
    • https://cdn.shopify.com/s/files/1/0430/7773/0464/files/super_vpn_proxy_master_app.pdf
    • https://cdn.shopify.com/s/files/1/0439/3464/6440/files/vajuvukolepotu.pdf
    • https://cdn.shopify.com/s/files/1/0438/5007/2224/files/pemawetaraveri.pdf
    • https://cdn.shopify.com/s/files/1/0428/1060/5735/files/swot_analysis_apple.pdf
    • https://cdn.shopify.com/s/files/1/0434/6871/8242/files/bujavinutew.pdf
    • https://cdn.shopify.com/s/files/1/0430/5770/9210/files/approval_form_1b.pdf
    • https://cdn.shopify.com/s/files/1/0434/6707/9830/files/curso_superior_de_economia_politica_spiridonova.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005eb2.bin
2fe7456ee26b385b77c7f946a4c8826c0929085cb2ae7445948e6bf677ec0efd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5EB2 5408 bytes
font_01_sfnt_off0000712a.bin
e9a5a1f6ed95b1e3669933bb00002ad32a1708c3e0b735191cad5e02368a6c7d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x712A 1800 bytes
font_02_sfnt_off000079b7.bin
772a069d3db7f9472f0093c88ca015442437ecdc3ac2fb4ead1e2c134af3811f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79B7 9980 bytes

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