Malicious PDF — malware analysis report

Static analysis result for SHA-256 0df68682ba8b93bf…

MALICIOUS

PDF

58.6 KB Created: 2020-08-21 09:49:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5e9ec929ac7171b4d31bdbe8201e2ea6 SHA-1: 31ccde9523da81adb836ccb5bc08e7d3a3871bb0 SHA-256: 0df68682ba8b93bfb059f80813d2a9f8a96ab08bcc6d8fd3a597c01f224d71a1
154 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to a redirector service known to host malicious content. The primary malicious link identified is https://ttraff.com/pify?keyword=organizzazione+di+cemento+armato+pdf, which is flagged as a malicious redirector. The document body itself is heavily obfuscated and contains what appears to be junk data, but the presence of numerous links and the ML classifier's high confidence score indicate a malicious intent, likely to lead users to phishing sites or download further malware.

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/pify?keyword=organizzazione+di+cemento+armato+pdf
    • http://files.messydogkato.com/uploads/1/3/0/7/130739519/pibovufeto-sexigabuve-pafirigobi.pdf
    • http://files.thelittlethingsilove.com/uploads/1/3/1/4/131410747/8549308.pdf
    • http://files.studyismybuddy.com/uploads/1/3/1/4/131438848/burik.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/2041/8198/files/strength_of_materials_notes_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/8984/5667/files/85251179286.pdf
    • https://cdn.shopify.com/s/files/1/0435/6728/4383/files/tutije.pdf
    • https://cdn.shopify.com/s/files/1/0431/6063/3493/files/juwavoguvabululitowef.pdf
    • https://cdn.shopify.com/s/files/1/0431/7764/0092/files/vawesoxoki.pdf
    • https://cdn.shopify.com/s/files/1/0431/6584/3620/files/archaeologies_of_sexuality.pdf
    • https://cdn.shopify.com/s/files/1/0428/8688/9639/files/suwegav.pdf
    • https://cdn.shopify.com/s/files/1/0429/5763/5735/files/nasinigibawugep.pdf
    • https://cdn.shopify.com/s/files/1/0432/3685/1874/files/vezofubujuxo.pdf
    • https://cdn.shopify.com/s/files/1/0430/8110/5562/files/5630864625.pdf
    • https://cdn.shopify.com/s/files/1/0439/0957/8907/files/19925475436.pdf
    • https://cdn.shopify.com/s/files/1/0429/7365/9290/files/sevefezabifotijumuziv.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://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008f30.bin
afaa310e36282285090cef6af9c7a4d5f3ee08bc53237acb550e8646411bbc41		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8F30 5340 bytes
font_01_sfnt_off0000a14c.bin
19e27140552571e819eec3ed0c6ca0877e552398fe6b6a5edb72560c25a0ea02		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA14C 11520 bytes
font_02_sfnt_off0000c6e7.bin
713933360072c9d59346590fad668f98c3603c6d2b72ed941ce85481f6af0b74		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC6E7 16060 bytes

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