Malicious PDF — malware analysis report

Static analysis result for SHA-256 b67e0f628dd9c8d7…

MALICIOUS

PDF

51.8 KB Created: 2020-08-14 06:55:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: da4f4e0a22e31db51840fce126e4c0c2 SHA-1: 2d9fb9c644a053373410efaac147e5bebe5f6c4e SHA-256: b67e0f628dd9c8d7efa878e8cf220c96d8b2348990767b8f27f8219f487fdffa
152 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one identified as a known malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://ttraff.com/pify?keyword=slack+ios++video', which is also listed as a malicious redirector. The presence of numerous links, many pointing to Shopify domains but likely serving as a link farm, suggests an attempt to obscure the final malicious destination. 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=slack+ios++video
    • http://gamiluta.mcrudin.com/uploads/1/3/2/3/132303382/davagixit_tejixuv_kilabodogodaluk.pdf
    • http://xovat.dspespta.com/uploads/1/3/0/8/130814328/xajoguwoxub.pdf
    • http://files.mycountyparks.org/uploads/1/3/2/7/132710763/sopamobim.pdf
    • http://files.rossmiller.co/uploads/1/3/0/8/130874201/faac030cd18.pdf
    • https://cdn.shopify.com/s/files/1/0437/2201/4885/files/nafixepilogod.pdf
    • https://cdn.shopify.com/s/files/1/0433/1143/1838/files/assets_liabilities_and_equity.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nejoxalivivurotuzepebibus.pdf
    • https://cdn.shopify.com/s/files/1/0429/3161/7945/files/10191303363.pdf
    • https://cdn.shopify.com/s/files/1/0431/3566/4284/files/67348293044.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/45927795399.pdf
    • https://cdn.shopify.com/s/files/1/0432/8954/2809/files/91812603833.pdf
    • https://cdn.shopify.com/s/files/1/0434/3562/2552/files/vefexuruzunosi.pdf
    • https://cdn.shopify.com/s/files/1/0430/4365/1735/files/28595013392.pdf
    • https://cdn.shopify.com/s/files/1/0428/9832/5663/files/98968571921.pdf
    • https://cdn.shopify.com/s/files/1/0427/8714/3839/files/85460186168.pdf
    • https://cdn.shopify.com/s/files/1/0430/8526/7097/files/21074560920.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/32829552166.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_off000060e2.bin
0f9d886bd88e13bd1a31fd3dd5457149ec9b4bd399e795e0bd34417923c30fd4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60E2 5064 bytes
font_01_sfnt_off0000721b.bin
05ac9ecb47d3f0767e5ffa10402d055fc6b4f1aa0480a6ec5b7d73f782a4e0c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x721B 4944 bytes
font_02_sfnt_off00008457.bin
320b8696242f1d7fd2747f52156dcb49c5abfe82ced13c70431afb40aadc65b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8457 10384 bytes
font_03_sfnt_off0000a820.bin
8ebdce340121941414a3293d313d865a8dd4f08e2ffefa5a5f0cd20a04790533		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA820 17544 bytes

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