Malicious PDF — malware analysis report

Static analysis result for SHA-256 450beccd2dabadbd…

MALICIOUS

PDF

41.5 KB Created: 2020-09-04 03:50:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 19bd4adb8634aa2abc886e6f14a80f2b SHA-1: 0cbe51d8ae1ffac840f5eb6f1ffd58a021938260 SHA-256: 450beccd2dabadbd5849faf16e25a4ffbfefa845e4b62f158a376c50e5b8fa60
152 Risk Score

Malware Insights

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

The PDF was flagged by multiple critical heuristics for containing malicious redirector links and a link farm. The embedded URL 'https://ttraff.club/pify?keyword=visual+basic+language' is a primary indicator of malicious intent, likely serving as a gateway to further malicious content. The ML classifier also strongly indicated maliciousness. The document body contains garbled text but includes the same suspicious URL and references to other PDFs hosted on static.usrfiles.com.

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.club/pify?keyword=visual+basic+language
    • https://static.usrfiles.com/ugd/67e251_bb2fd44e8a3742bd830bd3c539b6bc97.pdf
    • https://static.usrfiles.com/ugd/f0e51d_a852154690b34a2087308b82abdffa38.pdf
    • https://static.usrfiles.com/ugd/5f4192_a6d3dca726d948bb83eff9ea1d385c52.pdf
    • https://static.usrfiles.com/ugd/b8c837_bf389887f0244118b4bec65dfc8c4ee2.pdf
    • https://static.usrfiles.com/ugd/e3c460_efb5bebfb2de40e08ef12a15da5bdd91.pdf
    • https://static.usrfiles.com/ugd/9c43ec_b7ba8bbfd4044923ada65f8b280f840f.pdf
    • https://static.usrfiles.com/ugd/b8c837_725fe377594c4bc2a1c6cf20a1e3f041.pdf
    • https://static.usrfiles.com/ugd/f63f29_0a213c9ba26447829743309d77727055.pdf
    • https://cdn.shopify.com/s/files/1/0432/7201/1941/files/75372683575.pdf
    • https://cdn.shopify.com/s/files/1/0429/7628/0729/files/41424574596.pdf
    • https://cdn.shopify.com/s/files/1/0434/3191/9765/files/fitafipanapetilami.pdf
    • https://cdn.shopify.com/s/files/1/0434/1330/7541/files/95056369043.pdf
    • https://cdn.shopify.com/s/files/1/0437/6998/7221/files/laminate_sheet_cutting_knife.pdf
    • https://static.usrfiles.com/ugd/b8c837_c006eff4af144b62b554a8e6e65f7e1c.pdf
    • https://static.usrfiles.com/ugd/0e6328_43c53642f13344ebb3df2fdb8a447809.pdf
    • https://static.usrfiles.com/ugd/3de8a6_f3b83056262042778d90f164ab9bb09f.pdf
    • https://static.usrfiles.com/ugd/cc03df_dae26067af7741f7b534b2c2cd8e0ec7.pdf
    • https://static.usrfiles.com/ugd/aec2ea_5c5b755478304f709d4360f61aec9d22.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_off000065bd.bin
49502e7ec5197b213ed24a7eed816d43fe8ecce14026bddf81222fe64223793d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65BD 4976 bytes
font_01_sfnt_off000076c2.bin
3725e115cf39d4756b58508fd95f4fb6fc631ad3abf4f45b2e5165d13f177fb2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76C2 10128 bytes

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