Malicious PDF — malware analysis report

Static analysis result for SHA-256 3995dfb3b77bd5a3…

MALICIOUS

PDF

48.6 KB Created: 2020-08-05 16:31:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 204e9112af47d337147fa12c73e403c8 SHA-1: 359d334856ae4f56eb19012bb6cdf772e8dd24f2 SHA-256: 3995dfb3b77bd5a32ab5d40d7d9efd2935d40867b9968a04cfc3763c30be1bde
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link that redirects to a malicious domain, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body and embedded URLs suggest a lure to download a PDF, likely to trick users into visiting the malicious redirector. The ML classifier also strongly indicated 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.com/pify?keyword=igcse+cambridge+international+mathematics+0607+extended+book+pdf
    • http://files.vizstationstl.com/uploads/1/3/1/4/131482887/gutinaza.pdf
    • http://files.fabulous-you.biz/uploads/1/3/1/0/131070149/sukowuruzewalor-nitazipupe-kimimarodojukeb.pdf
    • http://files.fyldecoastrunners.com/uploads/1/3/1/4/131482886/ae266c2.pdf
    • http://files.ronnieroseband.com/uploads/1/3/0/8/130813797/a7f99.pdf
    • http://files.kenairiverfoundation.org/uploads/1/3/1/4/131453034/simivutefavazu_rutame_jatobu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zofes.pdf
    • https://cdn.shopify.com/s/files/1/0430/0144/6551/files/rasowazifanupakabamuw.pdf
    • https://cdn.shopify.com/s/files/1/0434/0409/9740/files/git_branching_model.pdf
    • https://cdn.shopify.com/s/files/1/0432/8852/7013/files/95162884797.pdf
    • https://cdn.shopify.com/s/files/1/0429/5376/9123/files/77656496697.pdf
    • https://cdn.shopify.com/s/files/1/0432/6876/7907/files/apostila_traados_de_caldeiraria_senai_pdf.pdf
    • https://cdn.shopify.com/s/files/1/0432/5621/7750/files/xuwib.pdf
    • https://cdn.shopify.com/s/files/1/0433/0127/3758/files/2141984410.pdf
    • https://cdn.shopify.com/s/files/1/0429/8371/9071/files/zejupofixapikabuw.pdf
    • https://cdn.shopify.com/s/files/1/0438/2212/1122/files/47775063896.pdf
    • https://cdn.shopify.com/s/files/1/0434/5148/2278/files/41148971435.pdf
    • https://cdn.shopify.com/s/files/1/0448/0778/2557/files/i_ching.pdf
    • https://cdn.shopify.com/s/files/1/0428/0070/9791/files/pesuwujaja.pdf
    • https://cdn.shopify.com/s/files/1/0435/5178/5109/files/jojagekakepuxagosama.pdf
    • https://cdn.shopify.com/s/files/1/0433/7896/6686/files/tazapixapisirumiguxiri.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_off00006b73.bin
fda7502d38baf9d593f1cd7c139d05f83984819d145b4bbb5bbf493f60f9fc75		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B73 3232 bytes
font_01_sfnt_off0000772a.bin
9888bb4ea8c4f801995c113e10a1bb7a0ef8332d98e34891a22ca7381c114f82		 pdf-font-stream PDF embedded font (sfnt) at offset 0x772A 6152 bytes
font_02_sfnt_off00008bf9.bin
dcee5b4e3a96ab39bdb2ae5ad131fe660ffed4386ebd80049299cdb4a0cfd098		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8BF9 11276 bytes

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