Malicious PDF — malware analysis report

Static analysis result for SHA-256 426de5cad821314a…

MALICIOUS

PDF

41.6 KB Created: 2020-09-03 19:26:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fcd959bee1855d107ea98c483648a4ef SHA-1: 6ca1a969472206d80c7b8e0d20ed260d314f153c SHA-256: 426de5cad821314a824bc18412d365275e77a950146e053232f2fb31a335961c
152 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with one critical heuristic identifying a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the URL 'https://ttraff.me/wix?keyword=vsco+cam+full+pack+apk+for+ios', suggesting a lure to download potentially unwanted or malicious software. The ML classifier also 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.me/wix?keyword=vsco+cam+full+pack+apk+for+ios
    • https://cdn.shopify.com/s/files/1/0439/2511/0952/files/william_wilson_edgar_allan_poe_english.pdf
    • https://cdn.shopify.com/s/files/1/0430/3536/1442/files/44406856639.pdf
    • https://cdn.shopify.com/s/files/1/0433/2254/0185/files/88597553933.pdf
    • https://cdn.shopify.com/s/files/1/0435/4103/7208/files/tixulipe.pdf
    • https://cdn.shopify.com/s/files/1/0450/1287/7462/files/fanivikusalat.pdf
    • https://cdn.shopify.com/s/files/1/0430/7927/0549/files/fat_sick_and_nearly_dead_food_pyramid.pdf
    • https://cdn.shopify.com/s/files/1/0430/7278/2489/files/844307871.pdf
    • https://cdn.shopify.com/s/files/1/0432/4396/2532/files/sinusitis_guidelines_european.pdf
    • https://static.usrfiles.com/ugd/bbd3cf_7b742fb6b59b4ba780c2586e3ed4e6a1.pdf
    • https://static.usrfiles.com/ugd/d54300_c85fa7eb56fd4724a683ddf9caf41e3c.pdf
    • https://static.usrfiles.com/ugd/c0a468_a95dbb9b4ff6469bba8cce33ee5748d7.pdf
    • https://static.usrfiles.com/ugd/b8c837_255a84215a284ca88d45dcb08a210a2e.pdf
    • https://static.usrfiles.com/ugd/d54300_fcd7f970ba104d26abd902543f389051.pdf
    • https://static.usrfiles.com/ugd/8b97dd_3282d031231d46979b140e69c775bb1d.pdf
    • https://static.usrfiles.com/ugd/b8c837_570843dfa00848aa8f001642ff081495.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_off00005c67.bin
c9910a191f8854fa06f132ffc89c93684a04b5b583f69c357605a41989acba94		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C67 5188 bytes
font_01_sfnt_off00006dfa.bin
de5ab0c60cb3c322fa4b5ac3b76f3b2153b3606e7c880b2624fb1b6257133dd8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DFA 1944 bytes
font_02_sfnt_off00007742.bin
5817aca2292c9108321ca49c1ffd5e7bdbc997603a583b139ef913fbf220a378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7742 9852 bytes

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