Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e6c4100ae153513…

MALICIOUS

PDF

45.5 KB Created: 2020-08-17 10:30:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: efcd7e0a05d9d558661f50ec0e31da76 SHA-1: dd3991b8cc30b0780ad131f430f7ad32a214ab73 SHA-256: 2e6c4100ae153513f36a2f651ca4c561ceb2d4e4f0f9b41c86e4199cf2d77fe4
152 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text related to a 'Terraria aquatic scourge guide' and the malicious URL. The presence of numerous external PDF links, including one to a Shopify domain, suggests a link farm or redirection strategy to distribute malicious content. The ML classifier strongly flagged this PDF as malicious.

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=terraria+aquatic+scourge+guide
    • http://rosodo.sekolahberpikirindonesia.com/uploads/1/3/0/8/130873851/6abcf6b.pdf
    • http://sogid.ndsportschannel.com/uploads/1/3/1/4/131437657/932a203193d.pdf
    • http://files.eguastella.com/uploads/1/3/1/8/131871690/4656610.pdf
    • http://files.dbehrends.com/uploads/1/3/1/3/131381414/lanubavu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/51108684678.pdf
    • https://cdn.shopify.com/s/files/1/0431/3828/5725/files/jugesiz.pdf
    • https://cdn.shopify.com/s/files/1/0430/2834/9079/files/23360335110.pdf
    • https://cdn.shopify.com/s/files/1/0427/9477/8791/files/92994785927.pdf
    • https://cdn.shopify.com/s/files/1/0432/8488/9758/files/dilal.pdf
    • https://cdn.shopify.com/s/files/1/0434/4276/5991/files/zilerepegagerexuzelosaf.pdf
    • https://cdn.shopify.com/s/files/1/0427/6482/8839/files/nuvepezamebifezikavapu.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007571.bin
7266fd527a8a1baa427ffcf7ac5d7ac6842b45f628189127f2cd0b3804b38eae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7571 5148 bytes
font_01_sfnt_off000086f1.bin
f8f628fd6035dda8a30379836e5d100a662b6b00a5d6755ef704371d9eac7d3b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x86F1 10076 bytes

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