Malicious PDF — malware analysis report

Static analysis result for SHA-256 033ffe5873e2de2c…

MALICIOUS

PDF

56.3 KB Created: 2020-08-31 06:33:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4141649ede4deea4192519d0acb5ea12 SHA-1: 6a70896d7849844dff81eddc55e68a4e6fb8f4a3 SHA-256: 033ffe5873e2de2c9413fcb2adb9a95d5b5de9508b2c2a4f269aa2bac24aa944
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs, many of which are benign but likely serve to obscure the malicious destination. The ML classifier also strongly flagged this PDF as malicious. The presence of embedded URLs suggests an attempt to lure the user to a malicious site, likely for phishing or malware distribution.

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=%25D9%2585%25D9%258A%25D8%25AC%25D8%25A7+%25D8%25A8%25D9%2584%25D8%25A7%25D8%25B2%25D8%25A7+%25D9%2584%25D9%2584%25D8%25A5%25D9%258A%25D8%25AC%25D8%25A7%25D8%25B1
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/ba3095_c6b23f1863f14f80bd206de44b32fb85.pdf
    • https://static.usrfiles.com/ugd/3fc21f_44b0163bb4ca44b190d2811ee2ca1995.pdf
    • https://static.usrfiles.com/ugd/b8c837_fe32f41167d64790aa6cbf2f5ab06d77.pdf
    • https://static.usrfiles.com/ugd/b8c837_8800f48600f345069d2bbca9e13aedf9.pdf
    • https://cdn.shopify.com/s/files/1/0438/5262/8118/files/45197722024.pdf
    • https://cdn.shopify.com/s/files/1/0433/9888/9635/files/btec_business_level_3_book_2.pdf
    • https://cdn.shopify.com/s/files/1/0428/9118/2243/files/69736014976.pdf
    • https://cdn.shopify.com/s/files/1/0436/5654/4409/files/bahaya_politik_identitas.pdf
    • https://cdn.shopify.com/s/files/1/0432/4311/0564/files/90751478499.pdf
    • https://cdn.shopify.com/s/files/1/0432/8387/3942/files/xinojiwabafu.pdf
    • https://cdn.shopify.com/s/files/1/0430/6750/6849/files/59895376480.pdf
    • https://cdn.shopify.com/s/files/1/0433/9141/8518/files/neet_application_form_2020.pdf
    • https://cdn.shopify.com/s/files/1/0433/5720/8731/files/41854904615.pdf
    • https://cdn.shopify.com/s/files/1/0440/2449/6286/files/absa_loan_application_form.pdf
    • https://cdn.shopify.com/s/files/1/0434/5279/2982/files/10412959169.pdf
    • https://cdn.shopify.com/s/files/1/0435/2750/4024/files/zemozazad.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/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License
    • http://scripts.sil.org/OFL

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off00009c24.bin
67387ef1b6f6629e71e870e65fb393e27ceb20472b3cb927ff74187ca6a90307		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x9C24 30120 bytes
font_00_sfnt_off00005874.bin
8ae8b889e14334fd7c3bfef0863c5ffd1f5171fa7500dc98ef9c4a98fd0b2123		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5874 4068 bytes
font_01_sfnt_off00006652.bin
50743e1554a39a1bbd97b3c4816abb7dec7ed672a71d896d0fe9af220e104457		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6652 17244 bytes
font_02_sfnt_off00007f11.bin
a0137a089f9ec1d437a094941af0e4c2d32276ae87d8074691972b14906497bc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F11 8408 bytes

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