Malicious PDF — malware analysis report

Static analysis result for SHA-256 80b5cefb0e33e82e…

MALICIOUS

PDF

48.0 KB Created: 2020-09-01 02:00:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1ac466acc1b201e10676ce9381aece75 SHA-1: 8b943bb47926236800a36956b5c0df2d840eda99 SHA-256: 80b5cefb0e33e82e2d8a6df5e5344423fe44c0d835336b2cc87af092fa34e450
152 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links, with a critical heuristic firing indicating it is a malicious redirector link farm. The primary URL identified, https://ttraff.ru/wix?keyword=graphs+of+relations+and+functions+worksheet, is flagged as a known malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting the document's purpose is to lure users to malicious sites.

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.ru/wix?keyword=graphs+of+relations+and+functions+worksheet
    • https://static.usrfiles.com/ugd/3d0627_e76aa30fe2ce4e3d99db2acd6d59624e.pdf
    • https://static.usrfiles.com/ugd/b8c837_f69efc7993d64722bb3375252cf638f6.pdf
    • https://static.usrfiles.com/ugd/b8c837_4599b1e1f34d4d9885625c493d52c647.pdf
    • https://cdn.shopify.com/s/files/1/0427/6482/8839/files/xemafonumo.pdf
    • https://cdn.shopify.com/s/files/1/0427/4490/5884/files/lor_stackks_you_knew.pdf
    • https://cdn.shopify.com/s/files/1/0429/2545/7575/files/canon_7d_mark_ii_tutorial.pdf
    • https://static.usrfiles.com/ugd/fafc38_7aca53ac6c984d35ba05fd595a41a44f.pdf
    • https://static.usrfiles.com/ugd/a771bd_c96c16318f9f4d10b67e4b25cd91a026.pdf
    • https://static.usrfiles.com/ugd/12745a_a0892d6ac4c24fde828bbf87ae2ce904.pdf
    • https://static.usrfiles.com/ugd/b8c837_17f1c1cc5e7d4cbe956763da8340c39f.pdf
    • https://cdn.shopify.com/s/files/1/0429/1300/5724/files/doperotora.pdf
    • https://cdn.shopify.com/s/files/1/0436/0319/8114/files/adjacent_channel_interference_in_mobile_communication.pdf
    • https://cdn.shopify.com/s/files/1/0433/3905/5253/files/68223089574.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000057b2.bin
95e8cc3c3f6ec28c8d30de7de75492eb8b5213bac9a83b7512b102daad8741e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x57B2 5312 bytes
font_01_sfnt_off000069cc.bin
20d71c651fa19e10c5e8f3a50cad87d5c46531e7d5cdd202fc954cf79784ea0a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69CC 10440 bytes
font_02_sfnt_off00008dc3.bin
25dc1b7d69cb91644f28a5d849e004c6f464f5b7ca2df743cc20f0bbd1bcfc9f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8DC3 16144 bytes
font_03_sfnt_off0000a2be.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA2BE 4324 bytes

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