Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ccc41822f2f099e…

MALICIOUS

PDF

37.3 KB Created: 2020-08-29 10:54:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 30ceb285f7a37aff808da4ac5aba2731 SHA-1: 0b74722b1b1c338447f69155f7a3c353d8371c8f SHA-256: 4ccc41822f2f099ee43a7239bd8f1ae5c705f92854cd8802363f2794aef3bd93
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://ttraff.cc/wix?keyword=6th+pay+commission+of+west+bengal+pensioners'. This URL is likely used to redirect the user to a malicious site. The document body, though heavily obfuscated, contains text related to '6th pay commission of west bengal pensioners', suggesting a lure to trick users into clicking the malicious link. The presence of numerous other PDF links, many pointing to 'static.usrfiles.com', indicates a link farm strategy, potentially to improve SEO for the malicious content.

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=6th+pay+commission+of+west+bengal+pensioners
    • https://static.usrfiles.com/ugd/b8c837_3e3b2b490fa644d5b36320bc24f030d3.pdf
    • https://static.usrfiles.com/ugd/b8c837_54e43c52bc5a4431b151cd18dfaaa17e.pdf
    • https://static.usrfiles.com/ugd/b8c837_1779f72805b5484d8595fa4a2d796370.pdf
    • https://static.usrfiles.com/ugd/b8c837_abb715f4e3aa43a9b7a73ebd4768e94e.pdf
    • https://static.usrfiles.com/ugd/b8c837_1cd81dc27d2d4ab3a7601226f188ad43.pdf
    • https://static.usrfiles.com/ugd/b8c837_cec5fffabf6c46e29bee0d0afaadb69c.pdf
    • https://static.usrfiles.com/ugd/b8c837_5eb25f9902e447c89147184e0b68948f.pdf
    • https://static.usrfiles.com/ugd/b8c837_2c098c1abc0841e68681a2d5887ad883.pdf
    • https://static.usrfiles.com/ugd/b8c837_4c559ab6ad0240098e7d9afceb6de721.pdf
    • https://static.usrfiles.com/ugd/b8c837_c5100807d3b64777b106570bcd38f556.pdf
    • https://static.usrfiles.com/ugd/b8c837_40eb60b50abe44e692d1f16c1938b99b.pdf
    • https://cdn.shopify.com/s/files/1/0434/7258/4870/files/startup_disk_creator_linux_mint.pdf
    • https://cdn.shopify.com/s/files/1/0436/3796/4960/files/naduxategalelibejuviwumif.pdf
    • https://cdn.shopify.com/s/files/1/0431/8298/1278/files/topaletagefukikituvota.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/vizinedidobirefeguj.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_off00004672.bin
094636e79cb78ffd22376c5e233eff8a624c57d82780c4cd1b02c722b0a7a63c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4672 5608 bytes
font_01_sfnt_off0000596b.bin
e17177a5a1fa1ced6715afe739ecf87f5c0375b6cd61b9245d2c1b2e160b6c32		 pdf-font-stream PDF embedded font (sfnt) at offset 0x596B 9576 bytes
font_02_sfnt_off00007a1c.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A1C 4324 bytes

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