Malicious PDF — malware analysis report

Static analysis result for SHA-256 8974fa312017c380…

MALICIOUS

PDF

57.7 KB Created: 2020-08-11 17:28:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e919de7334657d513dd947750ca73f90 SHA-1: 90ea8914a366f8c0c9d0c698913f08d5aa6da147 SHA-256: 8974fa312017c3803e9cba29fabc78bb088e36cfb1cf23d104abe77999d6af6f
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/pify?keyword=ashrae+comfort+chart+pdf'. This URL is presented in a way that suggests it is a legitimate search result for a technical document, likely to trick users into clicking. The PDF also contains a large number of external links, many hosted on Shopify, which is flagged as a link farm. The ML classifier strongly indicates maliciousness.

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.cc/pify?keyword=ashrae+comfort+chart+pdf
    • http://files.yajindustries.com/uploads/1/3/2/7/132740564/67a532859.pdf
    • http://natesu.afiniadentalportal.com/uploads/1/3/0/7/130740434/tevujaniwid_mupebelosuromiz_xirus_tutugigexovin.pdf
    • http://files.framemysore.org/uploads/1/3/1/3/131384789/7349004.pdf
    • http://files.lifestylefitness.club/uploads/1/3/1/4/131407135/kufelododigadif.pdf
    • http://files.wellnessbyannie.com/uploads/1/3/0/7/130740318/bixes.pdf
    • https://cdn.shopify.com/s/files/1/0428/7443/7791/files/85652776029.pdf
    • https://cdn.shopify.com/s/files/1/0429/3692/6374/files/30324965459.pdf
    • https://cdn.shopify.com/s/files/1/0431/4916/4705/files/46181970634.pdf
    • https://cdn.shopify.com/s/files/1/0431/0371/5489/files/livre_d_orthographe_franais.pdf
    • https://cdn.shopify.com/s/files/1/0433/2794/6904/files/35125122123.pdf
    • https://cdn.shopify.com/s/files/1/0430/0098/7801/files/89394578338.pdf
    • https://cdn.shopify.com/s/files/1/0429/2391/7478/files/73180457830.pdf
    • https://cdn.shopify.com/s/files/1/0431/1924/7514/files/61835373813.pdf
    • https://cdn.shopify.com/s/files/1/0434/4043/9446/files/37311948713.pdf
    • https://cdn.shopify.com/s/files/1/0433/5858/4986/files/aulas_de_ingles_portugues.pdf
    • https://cdn.shopify.com/s/files/1/0432/3092/0871/files/joindre_plusieurs_en_1.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_off0000964d.bin
5498afcd40faa1ea172e2094552218a992d117ee3eb5ad800ee02593621840ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x964D 4984 bytes
font_01_sfnt_off0000a733.bin
e21b0f21f19d3bc0d6738fb588b27e330495fb7b9f8d7737314af847a29de077		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA733 10556 bytes
font_02_sfnt_off0000cb60.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCB60 4324 bytes

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