Malicious PDF — malware analysis report

Static analysis result for SHA-256 91d1c2ce75c958b7…

MALICIOUS

PDF

86.3 KB Created: 2020-08-11 03:22:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d9b70453305cdc65b4cdb11ed35bf1cb SHA-1: 433cbd1151906060bc0bba1fd9105b1f94f1d926 SHA-256: 91d1c2ce75c958b7f1a7faef53b69d8b48e32dc7b3c02658f68fb986b3165cf8
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a significant number of embedded links pointing to various Shopify-hosted PDF files, forming a link farm. One of the primary links directs to a known malicious redirector. This suggests the document's purpose is likely related to SEO manipulation or distributing further malicious content, rather than providing legitimate information.

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=paganini+caprice+24+violin+pdf
    • http://files.heartofperfusion.com/uploads/1/3/1/4/131407284/ff69cf13cf6.pdf
    • http://gulerawo.westlakescampus.com/uploads/1/3/1/6/131607240/5323181.pdf
    • http://files.eagleforumoc.com/uploads/1/3/1/6/131636825/punubapovekatezajono.pdf
    • http://files.thbmed-rescue.co.uk/uploads/1/3/1/6/131606281/4116601.pdf
    • https://cdn.shopify.com/s/files/1/0430/4253/7629/files/82035452983.pdf
    • https://cdn.shopify.com/s/files/1/0428/6968/6431/files/tudik.pdf
    • https://cdn.shopify.com/s/files/1/0445/1460/7263/files/11425882236.pdf
    • https://cdn.shopify.com/s/files/1/0428/6863/7862/files/jevedubozivulogupon.pdf
    • https://cdn.shopify.com/s/files/1/0430/6426/2818/files/kisekelodexobaxinavotuzi.pdf
    • https://cdn.shopify.com/s/files/1/0437/5032/6426/files/rujafazokuvujinuf.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/52733892229.pdf
    • https://cdn.shopify.com/s/files/1/0433/4796/8149/files/mirak.pdf
    • https://cdn.shopify.com/s/files/1/0428/2351/6323/files/sepenafesuxipewavasa.pdf
    • https://cdn.shopify.com/s/files/1/0430/8218/6905/files/94908454581.pdf
    • https://cdn.shopify.com/s/files/1/0431/9579/3557/files/54507701691.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_off0000e14c.bin
0280a1900f7a8f0dfe8268ffe2b90b678a7eeea11e603ac2c0aee2549611a3e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE14C 5136 bytes
font_01_sfnt_off0000f2d4.bin
c22feff7bda7cfce05597868cc2eeaff328311e2abc9e2effeb19cc853c8bece		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D4 17176 bytes
font_02_sfnt_off00012746.bin
2cfc97915d250804213c9b0e6ad261e0979cd38371fb36ec9174dea58a153a3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12746 16120 bytes
font_03_sfnt_off00013c2d.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13C2D 4324 bytes

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