Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c2277708004c3ba…

MALICIOUS

PDF

47.9 KB Created: 2020-08-19 01:02:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c02892d6958c4c87a5619863fe928bc1 SHA-1: 9bd6dc99b66515860032cbb59e7acc76962e127a SHA-256: 7c2277708004c3bac474274402b2650db77432bb0886f8bdda7116525da703a7
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to link farms and redirectors. The primary malicious URL identified is `https://ttraff.ru/pify?keyword=como+se+forma+o+chocalho+da+cascavel`, which is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body itself appears to be corrupted or obfuscated, but the presence of numerous links and the redirector URL suggest an attempt to lead the user to 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.ru/pify?keyword=como+se+forma+o+chocalho+da+cascavel
    • http://kuxugixe.igottees.com/uploads/1/3/0/7/130740522/pelit-vawifafe.pdf
    • http://files.greenvillewesley.org/uploads/1/3/2/8/132814302/rorisixumolet_lujaxofutite_guguj.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/4607/4525/files/lapekikuguvatujeropepini.pdf
    • https://cdn.shopify.com/s/files/1/0431/8553/7175/files/96119953255.pdf
    • https://cdn.shopify.com/s/files/1/0436/1771/4334/files/bernie_sanders_medicare_for_all_plan.pdf
    • https://cdn.shopify.com/s/files/1/0434/4784/5030/files/balanopostitis_tratamiento.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/laxigitifudavizemitipa.pdf
    • https://cdn.shopify.com/s/files/1/0432/4841/8973/files/excel_sheet_application.pdf
    • https://cdn.shopify.com/s/files/1/0428/0628/0355/files/ios_for_macbook_pro_2010.pdf
    • https://cdn.shopify.com/s/files/1/0432/7797/5717/files/free_a4_brochure_template_word.pdf
    • https://cdn.shopify.com/s/files/1/0437/6562/9077/files/sogusetapivarelixu.pdf
    • https://cdn.shopify.com/s/files/1/0435/7675/4344/files/bazajumobunidival.pdf
    • https://cdn.shopify.com/s/files/1/0433/0140/4830/files/70965880418.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00009310.bin
35279ec1f258b4812c2cb59cb7e70f54800ca6e47e72a3a6888e4bc86ccec92b		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x9310 18512 bytes
font_00_sfnt_off00005c02.bin
ffd1d5e34448bf0dc0f02af54aa6e40005da37c80366f428728114f40d074e70		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C02 5224 bytes
font_01_sfnt_off00006da7.bin
165ae5baf0798f6446e3b4a28c8a96ee6c5c40f235a77ab99841276533433ae5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DA7 12100 bytes

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