Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9949b60d054e49b…

MALICIOUS

PDF

57.4 KB Created: 2020-08-12 03:33:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3931fba5f6077d2020763a26086e0b9b SHA-1: c03af7f5233c3ac5998347594f129e202a50e63f SHA-256: a9949b60d054e49b6aca0ed0f623e3c25d0d0b72fdbfd7cb5c1fee14e9902865
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of embedded links, many of which point to a redirector service. The ML classifier also flagged this PDF as malicious. The document body contains obfuscated text and multiple URLs, including a suspicious redirector URL. The primary attack pattern involves luring users to malicious websites through these embedded links.

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=las+reformas+borbonicas+en+el+peru+pdf
    • http://files.wormfoodforthough.net/uploads/1/3/0/9/130969243/e9c22e71c4f8.pdf
    • http://files.radhikarao.org/uploads/1/3/0/7/130776641/sewuwekajato_jixoz.pdf
    • http://jodaga.alexandriahustlerisingstars.com/uploads/1/3/0/9/130969489/7442736.pdf
    • https://cdn.shopify.com/s/files/1/0427/8996/1884/files/kitapugerogiribudamada.pdf
    • https://cdn.shopify.com/s/files/1/0440/3717/7494/files/lepaxawogusarezo.pdf
    • https://cdn.shopify.com/s/files/1/0428/0716/5095/files/catholic_lifetime_reading_plan.pdf
    • https://cdn.shopify.com/s/files/1/0435/8920/6174/files/52008671707.pdf
    • https://cdn.shopify.com/s/files/1/0428/5667/7543/files/tratamiento_nutricional_en_anemia_ferropenica.pdf
    • https://cdn.shopify.com/s/files/1/0429/9295/9642/files/99301925727.pdf
    • https://cdn.shopify.com/s/files/1/0432/7433/8454/files/85563683660.pdf
    • https://cdn.shopify.com/s/files/1/0435/6761/2063/files/oracle_pl_sql_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0430/9889/8592/files/4607987350.pdf
    • https://cdn.shopify.com/s/files/1/0436/5815/0046/files/basic_sql_queries.pdf
    • https://cdn.shopify.com/s/files/1/0433/0664/7717/files/sapareresajolomewonoro.pdf
    • https://cdn.shopify.com/s/files/1/0435/2756/9576/files/xemusawefudoserorekonenes.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007d21.bin
22d477db99957cb250af4a642bf11d8de71cb44e59e3bf4a13a501b440c79064		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D21 1880 bytes
font_01_sfnt_off00008644.bin
4b05332c1299dfe072161f6c248d9b60173dd2e3c69ac0f2ab3554c9a5d4c732		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8644 5384 bytes
font_02_sfnt_off00009875.bin
c97ffe4c12e96ce4704838cf5be3b9a47431e572822d2b6a6edb3f60542ce03f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9875 11796 bytes
font_03_sfnt_off0000beb0.bin
482d3104c6934c68feb94f85b3a43ac9f5d765b4463e79f0c495fa92c32fdca3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBEB0 16840 bytes

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