Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3763f5c954cc7c9…

MALICIOUS

PDF

40.9 KB Created: 2020-08-30 21:44:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c0ecb57e4e4d349ccad533043982a3bd SHA-1: 763b24513f6b7b9e0a9edce53ca667b704c04c3d SHA-256: f3763f5c954cc7c95a8a829ccea50b09368c7067b233097891f00d1cca527865
150 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and contains a critical heuristic indicating a malicious redirector link. The document body, though heavily obfuscated, contains the same URL found in the heuristic. This suggests the PDF's primary purpose is to lure users to the malicious domain.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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/wix?keyword=nacidos+para+correr+pdf
    • https://static.usrfiles.com/ugd/b8c837_d38ddbb468934632b2c0b4658c6776b2.pdf
    • https://static.usrfiles.com/ugd/ace02d_a077212687c848d5a733f92bc2101f98.pdf
    • https://static.usrfiles.com/ugd/b8c837_ab7dfa9ee2a349b39ab2e67218c33852.pdf
    • https://static.usrfiles.com/ugd/b8c837_66bfb316dbda4af18f4cef2f5d080f75.pdf
    • https://static.usrfiles.com/ugd/b8c837_71205bbc53eb4b099c60c9424b31e795.pdf
    • https://cdn.shopify.com/s/files/1/0428/3056/1436/files/liwosowi.pdf
    • https://cdn.shopify.com/s/files/1/0428/0877/0726/files/64298720804.pdf
    • https://cdn.shopify.com/s/files/1/0440/0575/2997/files/72622723632.pdf
    • https://cdn.shopify.com/s/files/1/0437/9469/4304/files/lunar_puzzle_neopets.pdf
    • https://cdn.shopify.com/s/files/1/0429/6641/7571/files/55465367173.pdf
    • https://cdn.shopify.com/s/files/1/0437/8660/0609/files/15988023151.pdf
    • https://cdn.shopify.com/s/files/1/0428/6971/9196/files/sixoximebosif.pdf
    • https://static.usrfiles.com/ugd/d9d1f5_a58dc2e8978b4eb5949895e331482b38.pdf
    • https://static.usrfiles.com/ugd/b8c837_697aaf178e0b4b4287b4993b826fa0c9.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_off00006124.bin
37322f87695d5151203adc2fb88aa395a3e0a1c1f5926f748f25aaf2f2d32ef0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6124 5084 bytes
font_01_sfnt_off0000727e.bin
25d580897fcd30da809f1a59e196adaaaa8b2cd63a45bfdfe3663e2185c44c61		 pdf-font-stream PDF embedded font (sfnt) at offset 0x727E 10752 bytes

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