Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a07c4aa192ad53a…

MALICIOUS

PDF

46.5 KB Created: 2020-08-11 01:18:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e32ce3356c6b9642507e4e8332864546 SHA-1: ecc0ecd90a5b796d2518d5fae9b5abfe4ef1976c SHA-256: 8a07c4aa192ad53a10e95c8f79be1970b56e77aeda85dc431784f5069965ecb3
154 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/pify?keyword=classifica%25C3%25A7%25C3%25A3o+dos+f%25C3%25A1rmacos+antiarr%25C3%25ADtmicos+pdf'. This indicates the document's primary purpose is to lure the user to a malicious site. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, limiting the analysis of further execution chains.

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=classifica%25C3%25A7%25C3%25A3o+dos+f%25C3%25A1rmacos+antiarr%25C3%25ADtmicos+pdf
    • http://files.gourmetgarlicgardens.com/uploads/1/3/0/7/130738875/suxoreditiwone.pdf
    • http://files.mathmovers.com/uploads/1/3/0/9/130969151/jafovunonipiz.pdf
    • http://files.art4himstudios.com/uploads/1/3/1/4/131453869/kevupudon.pdf
    • http://files.thehoneybeefactory.net/uploads/1/3/1/3/131398401/vonukuzik.pdf
    • https://cdn.shopify.com/s/files/1/0433/1572/4456/files/1168714591.pdf
    • https://cdn.shopify.com/s/files/1/0429/8624/2201/files/24566551077.pdf
    • https://cdn.shopify.com/s/files/1/0429/5180/3039/files/ergonomic_mechanical_keyboard.pdf
    • https://cdn.shopify.com/s/files/1/0429/6278/0311/files/tobulabaximuxufujexo.pdf
    • https://cdn.shopify.com/s/files/1/0432/0873/6927/files/99672833463.pdf
    • https://cdn.shopify.com/s/files/1/0431/1410/2941/files/vujufi.pdf
    • https://cdn.shopify.com/s/files/1/0434/6265/6165/files/rebotatilugakafutisize.pdf
    • https://cdn.shopify.com/s/files/1/0430/6714/6397/files/miwubarorazezaso.pdf
    • https://cdn.shopify.com/s/files/1/0434/0360/8231/files/master_microsoft_excel.pdf
    • https://cdn.shopify.com/s/files/1/0429/4977/1430/files/53323989279.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/fovurasavelibegesixaga.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006439.bin
a182dcd8271200faee6c79028f6bf5d85d21879a9fba1a4ca27e3ddac3cfb06e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6439 5784 bytes
font_01_sfnt_off0000763e.bin
9a3010de4486ef0145e9f05e6359d1663748180e9c90ff21d002232f74d2d5c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x763E 12512 bytes
font_02_sfnt_off00009c40.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9C40 4324 bytes

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