Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bd5b5f02dc41c1b…

MALICIOUS

PDF

50.1 KB Created: 2020-08-16 18:54:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 16b6c9631618351697ce8dc380157f47 SHA-1: 227357334677d61313bebb645d7bbc8b3ae470f9 SHA-256: 5bd5b5f02dc41c1ba8df0c61c8bb23e9eba5dbe90fefcc26b442f50ccae2cd86
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm or SEO poisoning tactic. One critical heuristic identified a link to a known malicious redirector, ttraff.com, which is likely used to obscure the final malicious destination. The document body, though heavily obfuscated, contains URLs that are likely part of this malicious infrastructure.

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=exponential+inequalities+worksheet+with+answers
    • http://files.thesolidrockshop.com/uploads/1/3/0/8/130813797/zaxisufibuxuxigusi.pdf
    • http://waxufuso.amadeussalem.com/uploads/1/3/1/3/131383982/6389897.pdf
    • http://files.mistergteacher.com/uploads/1/3/2/6/132682919/932b219b.pdf
    • http://files.corderovasquezlab.com/uploads/1/3/1/0/131071253/jewawebasenov.pdf
    • http://files.joeslodge.marketingfactorygroup.com/uploads/1/3/0/7/130739696/fisaduw-xidatejuwupadet-nopev.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/1878/7736/files/wuwubirilonoxosixidanizi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kosetomamevisired.pdf
    • https://cdn.shopify.com/s/files/1/0435/5021/2264/files/academic_journal_examples.pdf
    • https://cdn.shopify.com/s/files/1/0433/2702/9400/files/56019364630.pdf
    • https://cdn.shopify.com/s/files/1/0437/9751/2354/files/l_argumentation_juridique_stefan_goltzberg.pdf
    • https://cdn.shopify.com/s/files/1/0435/2675/0357/files/kotavagari.pdf
    • https://cdn.shopify.com/s/files/1/0427/6027/4087/files/ecosistema_bosque_humedo_tropical.pdf
    • https://cdn.shopify.com/s/files/1/0431/8819/1396/files/american_english_file_1_first_edition_teacher_s_book.pdf
    • https://cdn.shopify.com/s/files/1/0429/9830/0823/files/python_syslog_server.pdf
    • https://cdn.shopify.com/s/files/1/0431/8606/1473/files/balogh_mary_chomikuj.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/7082322425.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_off000063a6.bin
028bc2ce3e30d9978e8f626bf9e2944e3f2d71b12617ceac310d659fb593ce9c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63A6 5216 bytes
font_01_sfnt_off0000756e.bin
1f9868eb36b60e248c9c52c052aed4245b50f9eaec0934d45d0081b3205fdb27		 pdf-font-stream PDF embedded font (sfnt) at offset 0x756E 15220 bytes
font_02_sfnt_off0000a58f.bin
1c096a5399d210d3e4aad6eb52831a0090363eed99346ec1fd0bff994b5121a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA58F 16216 bytes

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