Malicious PDF — malware analysis report

Static analysis result for SHA-256 54277290dc41e552…

MALICIOUS

PDF

43.0 KB Created: 2020-08-30 05:58:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ead245ae82c41bb6f496213234835d79 SHA-1: 82840a1c881e860106db537de70b9a1f8ad052ee SHA-256: 54277290dc41e55214b7dca2e5aefea160fca1b7bd7ca404fd13a5f9aad602e0
154 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.com/wix?keyword=sirulolikinche+chinni+navvule+mp3+download'. Additionally, another critical heuristic indicates a PDF link farm, with many links hosted on 'static.usrfiles.com'. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the same malicious URL, suggesting the primary intent is to lure the user to this external 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.com/wix?keyword=sirulolikinche+chinni+navvule+mp3+download
    • https://static.usrfiles.com/ugd/286fb8_8374d9258869429582d10acf77a3a5c6.pdf
    • https://static.usrfiles.com/ugd/a18aa6_f673f916e0a44ccca740e5eb3b87ea47.pdf
    • https://static.usrfiles.com/ugd/b8c837_e4a9b8c7fff540ec9104eaa765281b81.pdf
    • https://static.usrfiles.com/ugd/b8c837_4efb80aefb604543b9579b418baff67c.pdf
    • https://static.usrfiles.com/ugd/b8c837_1ff3186acd834b2e8529789e18225bd5.pdf
    • https://cdn.shopify.com/s/files/1/0431/6656/4503/files/99702768601.pdf
    • https://static.usrfiles.com/ugd/b8c837_11d34a57ed924842a4d6bce29712cdaf.pdf
    • https://static.usrfiles.com/ugd/be19e1_6d5c55c7199447a8ad815129fed40642.pdf
    • https://static.usrfiles.com/ugd/b8c837_61e9ac62fda44b49bbb4f0c32d5f05b1.pdf
    • https://static.usrfiles.com/ugd/b8c837_ae06218149b2448b9d8164d7cf604aa0.pdf
    • https://static.usrfiles.com/ugd/b8c837_89ca5d07582545b3a6e3f7cf3843dbbc.pdf
    • https://cdn.shopify.com/s/files/1/0429/4069/4684/files/essentials_of_investments_9th_edition_free.pdf
    • https://cdn.shopify.com/s/files/1/0437/0015/8629/files/84234224429.pdf
    • https://cdn.shopify.com/s/files/1/0433/3443/4969/files/can_t_stop_this_feeling_sheet_music.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_off0000569d.bin
dd086c5455812a116a65041e0d7b0f451c44eaa64fefb1488582f953b136bc1f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x569D 5620 bytes
font_01_sfnt_off00006992.bin
0ec4bfbf1a833de5496649a4bc114c00d98fc0d6dd1f0d0452fd40857764660c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6992 5104 bytes
font_02_sfnt_off00007b3e.bin
5a221c5719c2f65bde0a969d8946b10a57fb1917412be94b71291f6168c6c7db		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B3E 10652 bytes

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