Malicious PDF — malware analysis report

Static analysis result for SHA-256 87331916e1c88dde…

MALICIOUS

PDF

47.0 KB Created: 2020-08-31 00:55:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2fc2b004c3e3ef5dda38ca379b5703d9 SHA-1: 1e578f5966f0d4536efdcedea6d4f2f75623ca89 SHA-256: 87331916e1c88dde10e26b3302b2749d1eee4e7a1a16ebdc43011c013f617fc4
152 Risk Score

Malware Insights

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

The PDF contains a high density of embedded links, with one critical heuristic firing indicating a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that matches the malicious redirector. The primary attack pattern involves luring users through these links, likely to a phishing or malware distribution site.

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=how+to+make+color+bombs+in+candy+cru
    • https://static.usrfiles.com/ugd/5fd5c1_43f010370d8548208fa6548c59140279.pdf
    • https://static.usrfiles.com/ugd/d17951_e3f751e469864fee8d51db4f0cec82ad.pdf
    • https://static.usrfiles.com/ugd/384ea4_89574741895d458ea2dfe83a3488682d.pdf
    • https://static.usrfiles.com/ugd/a64c8c_55b9ec073c9144daa44a8bc71b962101.pdf
    • https://static.usrfiles.com/ugd/b8c837_69ebd400c59e461aac51a34e190e0bb3.pdf
    • https://static.usrfiles.com/ugd/f65518_801164b099c548a486b721c12cdc3585.pdf
    • https://static.usrfiles.com/ugd/b8c837_5e363015ff504085a3de576f5df0ec33.pdf
    • https://static.usrfiles.com/ugd/b8c837_0da1e5018954483ea870a4ac914a12e6.pdf
    • https://cdn.shopify.com/s/files/1/0440/2629/8533/files/form_5329_t.pdf
    • https://cdn.shopify.com/s/files/1/0437/1765/6728/files/88090753975.pdf
    • https://cdn.shopify.com/s/files/1/0427/6148/6503/files/roboganezelefenerudoxam.pdf
    • https://cdn.shopify.com/s/files/1/0457/3403/5622/files/attached_please_find_the_requested_information.pdf
    • https://static.usrfiles.com/ugd/b8c837_dd9dd0d62511484da7117de698f3ab76.pdf
    • https://static.usrfiles.com/ugd/0047a4_067f0c954ae94bd39ca1c17e5ddc4bd5.pdf
    • https://static.usrfiles.com/ugd/756799_4a969968d56b4ea0b4efb4d241f0e3e9.pdf
    • https://static.usrfiles.com/ugd/7d21c0_96e3e5fb2848444a9857441f7da9f36a.pdf
    • https://static.usrfiles.com/ugd/9e41f0_540040857af94b2fb44cabd4d9151e05.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_off000068c2.bin
f434dc25443b4c30dc2f7065f55d45d6c20418a49ab42d628509bd319465567e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68C2 5444 bytes
font_01_sfnt_off00007b2e.bin
e24f4e4ea5bfc078c958d5aa4c13805a99631f9e3b327e50ddd1a9ad4169b210		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B2E 4316 bytes
font_02_sfnt_off00008b83.bin
f263d3969d1407e7532ef26c9702e38634b39d840589d81cf4230a2ac4f85992		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B83 10120 bytes

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